97640831 has 4 divisors (see below), whose sum is σ = 99911592. Its totient is φ = 95370072.

The previous prime is 97640801. The next prime is 97640839. The reversal of 97640831 is 13804679.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13804679 = 7 ⋅1972097.

It is a cyclic number.

It is not a de Polignac number, because 97640831 - 2²² = 93446527 is a prime.

It is a super-2 number, since 2×97640831² = 19067463756741122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97640839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1135316 + ... + 1135401.

It is an arithmetic number, because the mean of its divisors is an integer number (24977898).

Almost surely, 2^97640831 is an apocalyptic number.

97640831 is a deficient number, since it is larger than the sum of its proper divisors (2270761).

97640831 is a wasteful number, since it uses less digits than its factorization.

97640831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270760.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 97640831 is about 9881.3375106814. The cubic root of 97640831 is about 460.4796996462.

The spelling of 97640831 in words is "ninety-seven million, six hundred forty thousand, eight hundred thirty-one".