97431631 has 4 divisors (see below), whose sum is σ = 106289064. Its totient is φ = 88574200.

The previous prime is 97431623. The next prime is 97431637. The reversal of 97431631 is 13613479.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13613479 = 11 ⋅1237589.

It is not a de Polignac number, because 97431631 - 2³ = 97431623 is a prime.

It is a super-2 number, since 2×97431631² = 18985845438640322, 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 (97431637) 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, 4428700 + ... + 4428721.

It is an arithmetic number, because the mean of its divisors is an integer number (26572266).

Almost surely, 2^97431631 is an apocalyptic number.

97431631 is a deficient number, since it is larger than the sum of its proper divisors (8857433).

97431631 is a wasteful number, since it uses less digits than its factorization.

97431631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8857432.

The product of its digits is 13608, while the sum is 34.

The square root of 97431631 is about 9870.7462230573. The cubic root of 97431631 is about 460.1505981387.

The spelling of 97431631 in words is "ninety-seven million, four hundred thirty-one thousand, six hundred thirty-one".