97291631 has 4 divisors (see below), whose sum is σ = 97350792. Its totient is φ = 97232472.

The previous prime is 97291613. The next prime is 97291639. The reversal of 97291631 is 13619279.

It is a happy number.

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 97291631 - 2¹⁸ = 97029487 is a prime.

It is a super-2 number, since 2×97291631² = 18931322925280322, 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 (97291639) 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, 27041 + ... + 30426.

It is an arithmetic number, because the mean of its divisors is an integer number (24337698).

Almost surely, 2^97291631 is an apocalyptic number.

97291631 is a deficient number, since it is larger than the sum of its proper divisors (59161).

97291631 is a wasteful number, since it uses less digits than its factorization.

97291631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59160.

The product of its digits is 20412, while the sum is 38.

The square root of 97291631 is about 9863.6520112989. The cubic root of 97291631 is about 459.9300949223.

The spelling of 97291631 in words is "ninety-seven million, two hundred ninety-one thousand, six hundred thirty-one".