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999479521 = 17322118253
BaseRepresentation
bin111011100100101…
…101100011100001
32120122200211011001
4323210231203201
54021331321041
6243102152001
733524302315
oct7344554341
92518624131
10999479521
114731a8837
1223a882601
1312c0b7301
1496a53b45
155cb2c131
hex3b92d8e1

999479521 has 8 divisors (see below), whose sum is σ = 1058658984. Its totient is φ = 940343040.

The previous prime is 999479501. The next prime is 999479531. The reversal of 999479521 is 125974999.

It can be written as a sum of positive squares in 4 ways, for example, as 97318225 + 902161296 = 9865^2 + 30036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 999479521 - 29 = 999479009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999479501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45631 + ... + 63883.

It is an arithmetic number, because the mean of its divisors is an integer number (132332373).

Almost surely, 2999479521 is an apocalyptic number.

999479521 is the 18253-rd octagonal number.

It is an amenable number.

999479521 is a deficient number, since it is larger than the sum of its proper divisors (59179463).

999479521 is a wasteful number, since it uses less digits than its factorization.

999479521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21491.

The product of its digits is 1837080, while the sum is 55.

The square root of 999479521 is about 31614.5460350137. The cubic root of 999479521 is about 999.8264768915.

It can be divided in two parts, 999479 and 521, that added together give a 6-th power (1000000 = 106).

The spelling of 999479521 in words is "nine hundred ninety-nine million, four hundred seventy-nine thousand, five hundred twenty-one".

Divisors: 1 17 3221 18253 54757 310301 58792913 999479521