131564645 has 12 divisors (see below), whose sum is σ = 166626540. Its totient is φ = 99710784.

The previous prime is 131564627. The next prime is 131564647. The reversal of 131564645 is 546465131.

It can be written as a sum of positive squares in 2 ways, for example, as 88096996 + 43467649 = 9386^2 + 6593^2 .

It is a de Polignac number, because none of the positive numbers 2^k-131564645 is a prime.

It is a Curzon number.

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, 34640 + ... + 38249.

It is an arithmetic number, because the mean of its divisors is an integer number (13885545).

Almost surely, 2^131564645 is an apocalyptic number.

It is an amenable number.

131564645 is a deficient number, since it is larger than the sum of its proper divisors (35061895).

131564645 is an equidigital number, since it uses as much as digits as its factorization.

131564645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72932 (or 72913 counting only the distinct ones).

The product of its digits is 43200, while the sum is 35.

The square root of 131564645 is about 11470.1632507999. The cubic root of 131564645 is about 508.6039546825.

The spelling of 131564645 in words is "one hundred thirty-one million, five hundred sixty-four thousand, six hundred forty-five".