97655431 has 4 divisors (see below), whose sum is σ = 97675200. Its totient is φ = 97635664.

The previous prime is 97655407. The next prime is 97655471. The reversal of 97655431 is 13455679.

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 97655431 - 2¹⁵ = 97622663 is a prime.

It is a super-2 number, since 2×97655431² = 19073166407591522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97655471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4650 + ... + 14728.

It is an arithmetic number, because the mean of its divisors is an integer number (24418800).

Almost surely, 2^97655431 is an apocalyptic number.

97655431 is a deficient number, since it is larger than the sum of its proper divisors (19769).

97655431 is a wasteful number, since it uses less digits than its factorization.

97655431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19768.

The product of its digits is 113400, while the sum is 40.

The square root of 97655431 is about 9882.0762494528. The cubic root of 97655431 is about 460.5026499785.

The spelling of 97655431 in words is "ninety-seven million, six hundred fifty-five thousand, four hundred thirty-one".