131831477 has 4 divisors (see below), whose sum is σ = 136377420. Its totient is φ = 127285536.

The previous prime is 131831471. The next prime is 131831501. The reversal of 131831477 is 774138131.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32649796 + 99181681 = 5714^2 + 9959^2 .

It is a cyclic number.

It is not a de Polignac number, because 131831477 - 2⁸ = 131831221 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 (131831471) 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, 2272928 + ... + 2272985.

It is an arithmetic number, because the mean of its divisors is an integer number (34094355).

Almost surely, 2^131831477 is an apocalyptic number.

It is an amenable number.

131831477 is a deficient number, since it is larger than the sum of its proper divisors (4545943).

131831477 is an equidigital number, since it uses as much as digits as its factorization.

131831477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545942.

The product of its digits is 14112, while the sum is 35.

The square root of 131831477 is about 11481.7889285599. The cubic root of 131831477 is about 508.9475631192.

The spelling of 131831477 in words is "one hundred thirty-one million, eight hundred thirty-one thousand, four hundred seventy-seven".