131188591 has 8 divisors (see below), whose sum is σ = 132091344. Its totient is φ = 130289280.

The previous prime is 131188583. The next prime is 131188601. The reversal of 131188591 is 195881131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 131188591 - 2³ = 131188583 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 131188591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131188501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 164205 + ... + 165001.

It is an arithmetic number, because the mean of its divisors is an integer number (16511418).

Almost surely, 2^131188591 is an apocalyptic number.

131188591 is a deficient number, since it is larger than the sum of its proper divisors (902753).

131188591 is an equidigital number, since it uses as much as digits as its factorization.

131188591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1721.

The product of its digits is 8640, while the sum is 37.

The square root of 131188591 is about 11453.7588153409. The cubic root of 131188591 is about 508.1189077779.

The spelling of 131188591 in words is "one hundred thirty-one million, one hundred eighty-eight thousand, five hundred ninety-one".