131664961 has 4 divisors (see below), whose sum is σ = 131770800. Its totient is φ = 131559124.

The previous prime is 131664947. The next prime is 131665019. The reversal of 131664961 is 169466131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131664961 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131664961.

It is not an unprimeable number, because it can be changed into a prime (131664941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51031 + ... + 53548.

It is an arithmetic number, because the mean of its divisors is an integer number (32942700).

Almost surely, 2^131664961 is an apocalyptic number.

It is an amenable number.

131664961 is a deficient number, since it is larger than the sum of its proper divisors (105839).

131664961 is a wasteful number, since it uses less digits than its factorization.

131664961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105838.

The product of its digits is 23328, while the sum is 37.

The square root of 131664961 is about 11474.5353282824. The cubic root of 131664961 is about 508.7331893823.

The spelling of 131664961 in words is "one hundred thirty-one million, six hundred sixty-four thousand, nine hundred sixty-one".