131621165 has 16 divisors (see below), whose sum is σ = 172639488. Its totient is φ = 95743296.

The previous prime is 131621141. The next prime is 131621213. The reversal of 131621165 is 561126131.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131621165 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10757 + ... + 19466.

It is an arithmetic number, because the mean of its divisors is an integer number (10789968).

Almost surely, 2^131621165 is an apocalyptic number.

It is an amenable number.

131621165 is a deficient number, since it is larger than the sum of its proper divisors (41018323).

131621165 is a wasteful number, since it uses less digits than its factorization.

131621165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30308.

The product of its digits is 1080, while the sum is 26.

The square root of 131621165 is about 11472.6267698378. The cubic root of 131621165 is about 508.6767761208.

Adding to 131621165 its reverse (561126131), we get a palindrome (692747296).

The spelling of 131621165 in words is "one hundred thirty-one million, six hundred twenty-one thousand, one hundred sixty-five".