231097644 has 48 divisors (see below), whose sum is σ = 599961600. Its totient is φ = 76927248.

The previous prime is 231097639. The next prime is 231097661. The reversal of 231097644 is 446790132.

231097644 is a `hidden beast` number, since 2 + 3 + 1 + 0 + 9 + 7 + 644 = 666.

231097644 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×231097644² = 106812242124701472, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 231097599 and 231097608.

It is an unprimeable number.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154669 + ... + 156155.

It is an arithmetic number, because the mean of its divisors is an integer number (12499200).

Almost surely, 2^231097644 is an apocalyptic number.

It is an amenable number.

231097644 is an abundant number, since it is smaller than the sum of its proper divisors (368863956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231097644 is a wasteful number, since it uses less digits than its factorization.

231097644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2939 (or 2931 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 231097644 is about 15201.8960659518. The cubic root of 231097644 is about 613.6656853688.

The spelling of 231097644 in words is "two hundred thirty-one million, ninety-seven thousand, six hundred forty-four".