131977 has 4 divisors (see below), whose sum is σ = 132736. Its totient is φ = 131220.

The previous prime is 131969. The next prime is 132001. The reversal of 131977 is 779131.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 131977 - 2³ = 131969 is a prime.

It is a Duffinian number.

131977 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (131927) 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, 28 + ... + 514.

It is an arithmetic number, because the mean of its divisors is an integer number (33184).

2¹³¹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

131977 is a deficient number, since it is larger than the sum of its proper divisors (759).

131977 is an equidigital number, since it uses as much as digits as its factorization.

131977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758.

The product of its digits is 1323, while the sum is 28.

The square root of 131977 is about 363.2863884045. The cubic root of 131977 is about 50.9134762572.

The spelling of 131977 in words is "one hundred thirty-one thousand, nine hundred seventy-seven".