97715531 has 4 divisors (see below), whose sum is σ = 97735632. Its totient is φ = 97695432.

The previous prime is 97715489. The next prime is 97715539. The reversal of 97715531 is 13551779.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 97715531 - 2¹⁸ = 97453387 is a prime.

It is a super-2 number, since 2×97715531² = 19096649997223922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97715539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2306 + ... + 14168.

It is an arithmetic number, because the mean of its divisors is an integer number (24433908).

Almost surely, 2^97715531 is an apocalyptic number.

97715531 is a deficient number, since it is larger than the sum of its proper divisors (20101).

97715531 is a wasteful number, since it uses less digits than its factorization.

97715531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20100.

The product of its digits is 33075, while the sum is 38.

The square root of 97715531 is about 9885.1166406877. The cubic root of 97715531 is about 460.5970995254.

The spelling of 97715531 in words is "ninety-seven million, seven hundred fifteen thousand, five hundred thirty-one".