131365729 has 4 divisors (see below), whose sum is σ = 143308080. Its totient is φ = 119423380.

The previous prime is 131365727. The next prime is 131365733. The reversal of 131365729 is 927563131.

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.

It is a cyclic number.

It is not a de Polignac number, because 131365729 - 2¹ = 131365727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131365721) 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, 5971159 + ... + 5971180.

It is an arithmetic number, because the mean of its divisors is an integer number (35827020).

Almost surely, 2^131365729 is an apocalyptic number.

It is an amenable number.

131365729 is a deficient number, since it is larger than the sum of its proper divisors (11942351).

131365729 is a wasteful number, since it uses less digits than its factorization.

131365729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11942350.

The product of its digits is 34020, while the sum is 37.

The square root of 131365729 is about 11461.4889521388. The cubic root of 131365729 is about 508.3475015550.

The spelling of 131365729 in words is "one hundred thirty-one million, three hundred sixty-five thousand, seven hundred twenty-nine".