97791631 has 16 divisors (see below), whose sum is σ = 115061760. Its totient is φ = 81375840.

The previous prime is 97791623. The next prime is 97791649. The reversal of 97791631 is 13619779.

It is not a de Polignac number, because 97791631 - 2³ = 97791623 is a prime.

It is a super-3 number, since 3×97791631³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97731631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41965 + ... + 44233.

It is an arithmetic number, because the mean of its divisors is an integer number (7191360).

Almost surely, 2^97791631 is an apocalyptic number.

97791631 is a deficient number, since it is larger than the sum of its proper divisors (17270129).

97791631 is a wasteful number, since it uses less digits than its factorization.

97791631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2454.

The product of its digits is 71442, while the sum is 43.

The square root of 97791631 is about 9888.9651126900. The cubic root of 97791631 is about 460.7166381616.

The spelling of 97791631 in words is "ninety-seven million, seven hundred ninety-one thousand, six hundred thirty-one".