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999961993 = 6911447123
BaseRepresentation
bin111011100110100…
…011010110001001
32120200121022222101
4323212203112021
54021442240433
6243120353401
733531352042
oct7346432611
92520538871
10999961993
114734a8278
1223aa75861
1312c225ab4
1496b3b8c9
155cbc507d
hex3b9a3589

999961993 has 4 divisors (see below), whose sum is σ = 1001409808. Its totient is φ = 998514180.

The previous prime is 999961979. The next prime is 999962057. The reversal of 999961993 is 399169999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 399169999 = 1423280513.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-999961993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999961943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722871 + ... + 724252.

It is an arithmetic number, because the mean of its divisors is an integer number (250352452).

Almost surely, 2999961993 is an apocalyptic number.

It is an amenable number.

999961993 is a deficient number, since it is larger than the sum of its proper divisors (1447815).

999961993 is a wasteful number, since it uses less digits than its factorization.

999961993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447814.

The product of its digits is 9565938, while the sum is 64.

The square root of 999961993 is about 31622.1756525385. The cubic root of 999961993 is about 999.9873308395.

The spelling of 999961993 in words is "nine hundred ninety-nine million, nine hundred sixty-one thousand, nine hundred ninety-three".

Divisors: 1 691 1447123 999961993