97687521 has 6 divisors (see below), whose sum is σ = 141104210. Its totient is φ = 65125008.

The previous prime is 97687519. The next prime is 97687537. The reversal of 97687521 is 12578679.

It can be written as a sum of positive squares in only one way, i.e., 60233121 + 37454400 = 7761^2 + 6120^2 .

It is not a de Polignac number, because 97687521 - 2¹ = 97687519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97687501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5427076 + ... + 5427093.

Almost surely, 2^97687521 is an apocalyptic number.

It is an amenable number.

97687521 is a deficient number, since it is larger than the sum of its proper divisors (43416689).

97687521 is a wasteful number, since it uses less digits than its factorization.

97687521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10854175 (or 10854172 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 97687521 is about 9883.6997627407. The cubic root of 97687521 is about 460.5530855133.

The spelling of 97687521 in words is "ninety-seven million, six hundred eighty-seven thousand, five hundred twenty-one".