97639431 has 4 divisors (see below), whose sum is σ = 130185912. Its totient is φ = 65092952.

The previous prime is 97639397. The next prime is 97639441. The reversal of 97639431 is 13493679.

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 97639431 - 2¹⁰ = 97638407 is a prime.

It is a super-2 number, since 2×97639431² = 19066916972007522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97639441) 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, 16273236 + ... + 16273241.

It is an arithmetic number, because the mean of its divisors is an integer number (32546478).

Almost surely, 2^97639431 is an apocalyptic number.

97639431 is a deficient number, since it is larger than the sum of its proper divisors (32546481).

97639431 is a wasteful number, since it uses less digits than its factorization.

97639431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32546480.

The product of its digits is 122472, while the sum is 42.

The square root of 97639431 is about 9881.2666698152. The cubic root of 97639431 is about 460.4774988092.

The spelling of 97639431 in words is "ninety-seven million, six hundred thirty-nine thousand, four hundred thirty-one".