97972852581 has 24 divisors (see below), whose sum is σ = 141713101920. Its totient is φ = 65224504800.

The previous prime is 97972852553. The next prime is 97972852597. The reversal of 97972852581 is 18525827979.

97972852581 is a `hidden beast` number, since 9 + 7 + 9 + 7 + 28 + 525 + 81 = 666.

It is not a de Polignac number, because 97972852581 - 2¹¹ = 97972850533 is a prime.

It is a super-2 number, since 2×97972852581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97972852381) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35872986 + ... + 35875716.

It is an arithmetic number, because the mean of its divisors is an integer number (5904712580).

Almost surely, 2^97972852581 is an apocalyptic number.

It is an amenable number.

97972852581 is a deficient number, since it is larger than the sum of its proper divisors (43740249339).

97972852581 is a wasteful number, since it uses less digits than its factorization.

97972852581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6817 (or 6814 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 63.

The spelling of 97972852581 in words is "ninety-seven billion, nine hundred seventy-two million, eight hundred fifty-two thousand, five hundred eighty-one".