97138931 has 4 divisors (see below), whose sum is σ = 97219200. Its totient is φ = 97058664.

The previous prime is 97138919. The next prime is 97138933. The reversal of 97138931 is 13983179.

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 97138931 - 2²⁶ = 30030067 is a prime.

It is a super-2 number, since 2×97138931² = 18871943831645522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97138933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38291 + ... + 40748.

It is an arithmetic number, because the mean of its divisors is an integer number (24304800).

Almost surely, 2^97138931 is an apocalyptic number.

97138931 is a deficient number, since it is larger than the sum of its proper divisors (80269).

97138931 is a wasteful number, since it uses less digits than its factorization.

97138931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80268.

The product of its digits is 40824, while the sum is 41.

The square root of 97138931 is about 9855.9084309870. The cubic root of 97138931 is about 459.6893475948.

The spelling of 97138931 in words is "ninety-seven million, one hundred thirty-eight thousand, nine hundred thirty-one".