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999894481 = 2569338917
BaseRepresentation
bin111011100110010…
…010110111010001
32120200110220100221
4323212102313101
54021433110411
6243115113041
733530651155
oct7346226721
92520426327
10999894481
11473461583
1223aa42781
1312c201151
1496b21065
155cbb0071
hex3b992dd1

999894481 has 4 divisors (see below), whose sum is σ = 999959092. Its totient is φ = 999829872.

The previous prime is 999894419. The next prime is 999894487. The reversal of 999894481 is 184498999.

999894481 = 223592 + 223602.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 184498999 = 202990931.

It can be written as a sum of positive squares in 2 ways, for example, as 499969600 + 499924881 = 22360^2 + 22359^2 .

It is a cyclic number.

It is not a de Polignac number, because 999894481 - 27 = 999894353 is a prime.

It is a super-2 number, since 2×9998944812 = 1999577946268518722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999894487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6235 + ... + 45151.

It is an arithmetic number, because the mean of its divisors is an integer number (249989773).

Almost surely, 2999894481 is an apocalyptic number.

999894481 is the 22360-th centered square number.

It is an amenable number.

999894481 is a deficient number, since it is larger than the sum of its proper divisors (64611).

999894481 is a wasteful number, since it uses less digits than its factorization.

999894481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64610.

The product of its digits is 6718464, while the sum is 61.

The square root of 999894481 is about 31621.1081557873. The cubic root of 999894481 is about 999.9648257628.

The spelling of 999894481 in words is "nine hundred ninety-nine million, eight hundred ninety-four thousand, four hundred eighty-one".

Divisors: 1 25693 38917 999894481