131591893 has 4 divisors (see below), whose sum is σ = 131619168. Its totient is φ = 131564620.

The previous prime is 131591861. The next prime is 131591903. The reversal of 131591893 is 398195131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 398195131 = 17 ⋅23423243.

It is a cyclic number.

It is not a de Polignac number, because 131591893 - 2⁵ = 131591861 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 (131591813) 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, 4243 + ... + 16768.

It is an arithmetic number, because the mean of its divisors is an integer number (32904792).

Almost surely, 2^131591893 is an apocalyptic number.

It is an amenable number.

131591893 is a deficient number, since it is larger than the sum of its proper divisors (27275).

131591893 is an equidigital number, since it uses as much as digits as its factorization.

131591893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27274.

The product of its digits is 29160, while the sum is 40.

The square root of 131591893 is about 11471.3509666473. The cubic root of 131591893 is about 508.6390641248.

The spelling of 131591893 in words is "one hundred thirty-one million, five hundred ninety-one thousand, eight hundred ninety-three".