131881831 has 4 divisors (see below), whose sum is σ = 138823000. Its totient is φ = 124940664.

The previous prime is 131881829. The next prime is 131881853. The reversal of 131881831 is 138188131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138188131 = 47 ⋅2940173.

It is a cyclic number.

It is not a de Polignac number, because 131881831 - 2¹ = 131881829 is a prime.

It is a super-2 number, since 2×131881831² = 34785634695825122, which 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 (131881811) 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, 3470556 + ... + 3470593.

It is an arithmetic number, because the mean of its divisors is an integer number (34705750).

Almost surely, 2^131881831 is an apocalyptic number.

131881831 is a deficient number, since it is larger than the sum of its proper divisors (6941169).

131881831 is an equidigital number, since it uses as much as digits as its factorization.

131881831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6941168.

The product of its digits is 4608, while the sum is 34.

The square root of 131881831 is about 11483.9814959795. The cubic root of 131881831 is about 509.0123536229.

The spelling of 131881831 in words is "one hundred thirty-one million, eight hundred eighty-one thousand, eight hundred thirty-one".