131656717 has 4 divisors (see below), whose sum is σ = 134140860. Its totient is φ = 129172576.

The previous prime is 131656711. The next prime is 131656751. The reversal of 131656717 is 717656131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 717656131 = 181 ⋅3964951.

It can be written as a sum of positive squares in 2 ways, for example, as 35832196 + 95824521 = 5986^2 + 9789^2 .

It is a cyclic number.

It is not a de Polignac number, because 131656717 - 2¹⁵ = 131623949 is a prime.

It is a super-2 number, since 2×131656717² = 34666982262436178, 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 (131656711) 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, 1241992 + ... + 1242097.

It is an arithmetic number, because the mean of its divisors is an integer number (33535215).

Almost surely, 2^131656717 is an apocalyptic number.

It is an amenable number.

131656717 is a deficient number, since it is larger than the sum of its proper divisors (2484143).

131656717 is an equidigital number, since it uses as much as digits as its factorization.

131656717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484142.

The product of its digits is 26460, while the sum is 37.

The square root of 131656717 is about 11474.1760924260. The cubic root of 131656717 is about 508.7225713107.

The spelling of 131656717 in words is "one hundred thirty-one million, six hundred fifty-six thousand, seven hundred seventeen".