131500191 has 4 divisors (see below), whose sum is σ = 175333592. Its totient is φ = 87666792.

The previous prime is 131500189. The next prime is 131500199. The reversal of 131500191 is 191005131.

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

It is not a de Polignac number, because 131500191 - 2¹ = 131500189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131500199) 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, 21916696 + ... + 21916701.

It is an arithmetic number, because the mean of its divisors is an integer number (43833398).

Almost surely, 2^131500191 is an apocalyptic number.

131500191 is a deficient number, since it is larger than the sum of its proper divisors (43833401).

131500191 is an equidigital number, since it uses as much as digits as its factorization.

131500191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43833400.

The product of its (nonzero) digits is 135, while the sum is 21.

The square root of 131500191 is about 11467.3532691724. The cubic root of 131500191 is about 508.5208854708.

The spelling of 131500191 in words is "one hundred thirty-one million, five hundred thousand, one hundred ninety-one".