131988557431 has 4 divisors (see below), whose sum is σ = 136246252864. Its totient is φ = 127730862000.

The previous prime is 131988557429. The next prime is 131988557453. The reversal of 131988557431 is 134755889131.

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

It is a cyclic number.

It is not a de Polignac number, because 131988557431 - 2¹ = 131988557429 is a prime.

It is a super-2 number, since 2×131988557431² (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 (131988557461) 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, 2128847670 + ... + 2128847731.

It is an arithmetic number, because the mean of its divisors is an integer number (34061563216).

Almost surely, 2^131988557431 is an apocalyptic number.

131988557431 is a deficient number, since it is larger than the sum of its proper divisors (4257695433).

131988557431 is an equidigital number, since it uses as much as digits as its factorization.

131988557431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4257695432.

The product of its digits is 3628800, while the sum is 55.

The spelling of 131988557431 in words is "one hundred thirty-one billion, nine hundred eighty-eight million, five hundred fifty-seven thousand, four hundred thirty-one".