231656649 has 16 divisors (see below), whose sum is σ = 353781120. Its totient is φ = 132082560.

The previous prime is 231656627. The next prime is 231656653. The reversal of 231656649 is 946656132.

It is not a de Polignac number, because 231656649 - 2⁵ = 231656617 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 231656649.

It is not an unprimeable number, because it can be changed into a prime (231656699) 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, 2284 + ... + 21645.

It is an arithmetic number, because the mean of its divisors is an integer number (22111320).

Almost surely, 2^231656649 is an apocalyptic number.

It is an amenable number.

231656649 is a deficient number, since it is larger than the sum of its proper divisors (122124471).

231656649 is a wasteful number, since it uses less digits than its factorization.

231656649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24400.

The product of its digits is 233280, while the sum is 42.

The square root of 231656649 is about 15220.2709897032. The cubic root of 231656649 is about 614.1600881607.

The spelling of 231656649 in words is "two hundred thirty-one million, six hundred fifty-six thousand, six hundred forty-nine".