99597679281 has 27 divisors (see below), whose sum is σ = 146425126809. Its totient is φ = 65236446792.

The previous prime is 99597679211. The next prime is 99597679333. The reversal of 99597679281 is 18297679599.

The square root of 99597679281 is 315591.

It is a perfect power (a square), and thus also a powerful number.

99597679281 is a `hidden beast` number, since 9 + 9 + 597 + 6 + 7 + 9 + 28 + 1 = 666.

It is not a de Polignac number, because 99597679281 - 2²⁷ = 99463461553 is a prime.

It is a super-2 number, since 2×99597679281² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (99597679211) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 55858716 + ... + 55860498.

Almost surely, 2^99597679281 is an apocalyptic number.

99597679281 is the 315591-st square number.

99597679281 is the 157796-th centered octagonal number.

It is an amenable number.

99597679281 is a deficient number, since it is larger than the sum of its proper divisors (46827447528).

99597679281 is an frugal number, since it uses more digits than its factorization.

99597679281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3690 (or 1845 counting only the distinct ones).

The product of its digits is 154314720, while the sum is 72.

The spelling of 99597679281 in words is "ninety-nine billion, five hundred ninety-seven million, six hundred seventy-nine thousand, two hundred eighty-one".