131564646 has 24 divisors (see below), whose sum is σ = 297451440. Its totient is φ = 41948016.

The previous prime is 131564627. The next prime is 131564647. The reversal of 131564646 is 646465131.

It is a happy number.

131564646 is a `hidden beast` number, since 1 + 3 + 1 + 5 + 6 + 4 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 131564646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131564647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158481 + ... + 159308.

It is an arithmetic number, because the mean of its divisors is an integer number (12393810).

Almost surely, 2^131564646 is an apocalyptic number.

131564646 is an abundant number, since it is smaller than the sum of its proper divisors (165886794).

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

131564646 is a wasteful number, since it uses less digits than its factorization.

131564646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317820 (or 317817 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 131564646 is about 11470.1632943912. The cubic root of 131564646 is about 508.6039559711.

The spelling of 131564646 in words is "one hundred thirty-one million, five hundred sixty-four thousand, six hundred forty-six".