131757257 has 4 divisors (see below), whose sum is σ = 131931156. Its totient is φ = 131583360.

The previous prime is 131757239. The next prime is 131757281. The reversal of 131757257 is 752757131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 66406201 + 65351056 = 8149^2 + 8084^2 .

It is a cyclic number.

It is not a de Polignac number, because 131757257 - 2⁶ = 131757193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131757257.

It is not an unprimeable number, because it can be changed into a prime (131757287) 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, 85808 + ... + 87329.

It is an arithmetic number, because the mean of its divisors is an integer number (32982789).

Almost surely, 2^131757257 is an apocalyptic number.

It is an amenable number.

131757257 is a deficient number, since it is larger than the sum of its proper divisors (173899).

131757257 is an equidigital number, since it uses as much as digits as its factorization.

131757257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173898.

The product of its digits is 51450, while the sum is 38.

The square root of 131757257 is about 11478.5563987812. The cubic root of 131757257 is about 508.8520341402.

The spelling of 131757257 in words is "one hundred thirty-one million, seven hundred fifty-seven thousand, two hundred fifty-seven".