131242609631 has 4 divisors (see below), whose sum is σ = 149991553872. Its totient is φ = 112493665392.

The previous prime is 131242609621. The next prime is 131242609657. The reversal of 131242609631 is 136906242131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131242609631 is a prime.

It is a super-2 number, since 2×131242609631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131242609621) 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, 9374472110 + ... + 9374472123.

It is an arithmetic number, because the mean of its divisors is an integer number (37497888468).

Almost surely, 2^131242609631 is an apocalyptic number.

131242609631 is a deficient number, since it is larger than the sum of its proper divisors (18748944241).

131242609631 is an equidigital number, since it uses as much as digits as its factorization.

131242609631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18748944240.

The product of its (nonzero) digits is 46656, while the sum is 38.

The spelling of 131242609631 in words is "one hundred thirty-one billion, two hundred forty-two million, six hundred nine thousand, six hundred thirty-one".