131399979944 has 8 divisors (see below), whose sum is σ = 246374962410. Its totient is φ = 65699989968.

The previous prime is 131399979943. The next prime is 131399979959. The reversal of 131399979944 is 449979993131.

It can be written as a sum of positive squares in only one way, i.e., 126834275044 + 4565704900 = 356138^2 + 67570^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (131399979943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8212498739 + ... + 8212498754.

Almost surely, 2^131399979944 is an apocalyptic number.

It is an amenable number.

131399979944 is a deficient number, since it is larger than the sum of its proper divisors (114974982466).

131399979944 is a wasteful number, since it uses less digits than its factorization.

131399979944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16424997499 (or 16424997495 counting only the distinct ones).

The product of its digits is 59521392, while the sum is 68.

The spelling of 131399979944 in words is "one hundred thirty-one billion, three hundred ninety-nine million, nine hundred seventy-nine thousand, nine hundred forty-four".