131712779 has 4 divisors (see below), whose sum is σ = 143686680. Its totient is φ = 119738880.

The previous prime is 131712773. The next prime is 131712781. The reversal of 131712779 is 977217131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977217131 = 11 ⋅88837921.

It is a cyclic number.

It is not a de Polignac number, because 131712779 - 2⁸ = 131712523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131712773) 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, 5986934 + ... + 5986955.

It is an arithmetic number, because the mean of its divisors is an integer number (35921670).

Almost surely, 2^131712779 is an apocalyptic number.

131712779 is a deficient number, since it is larger than the sum of its proper divisors (11973901).

131712779 is a wasteful number, since it uses less digits than its factorization.

131712779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11973900.

The product of its digits is 18522, while the sum is 38.

The square root of 131712779 is about 11476.6187964923. The cubic root of 131712779 is about 508.7947690643.

The spelling of 131712779 in words is "one hundred thirty-one million, seven hundred twelve thousand, seven hundred seventy-nine".