131881 has 4 divisors (see below), whose sum is σ = 134992. Its totient is φ = 128772.

The previous prime is 131861. The next prime is 131891. The reversal of 131881 is 188131.

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: 188131 = 419 ⋅449.

It is a cyclic number.

It is not a de Polignac number, because 131881 - 2⁵ = 131849 is a prime.

It is a super-2 number, since 2×131881² = 34785196322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131861) 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, 1491 + ... + 1576.

It is an arithmetic number, because the mean of its divisors is an integer number (33748).

2¹³¹⁸⁸¹ is an apocalyptic number.

It is an amenable number.

131881 is a deficient number, since it is larger than the sum of its proper divisors (3111).

131881 is an equidigital number, since it uses as much as digits as its factorization.

131881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3110.

The product of its digits is 192, while the sum is 22.

The square root of 131881 is about 363.1542372051. The cubic root of 131881 is about 50.9011284509.

The spelling of 131881 in words is "one hundred thirty-one thousand, eight hundred eighty-one".