97279581 has 64 divisors (see below), whose sum is σ = 163676160. Its totient is φ = 50181120.

The previous prime is 97279579. The next prime is 97279583. The reversal of 97279581 is 18597279.

It is an interprime number because it is at equal distance from previous prime (97279579) and next prime (97279583).

It is not a de Polignac number, because 97279581 - 2¹ = 97279579 is a prime.

It is a super-2 number, since 2×97279581² = 18926633759071122, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 97279581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97279583) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1092985 + ... + 1093073.

It is an arithmetic number, because the mean of its divisors is an integer number (2557440).

Almost surely, 2^97279581 is an apocalyptic number.

It is an amenable number.

97279581 is a deficient number, since it is larger than the sum of its proper divisors (66396579).

97279581 is a wasteful number, since it uses less digits than its factorization.

97279581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226.

The product of its digits is 317520, while the sum is 48.

The square root of 97279581 is about 9863.0411638602. The cubic root of 97279581 is about 459.9111060109.

The spelling of 97279581 in words is "ninety-seven million, two hundred seventy-nine thousand, five hundred eighty-one".