131251685357 has 4 divisors (see below), whose sum is σ = 141347968860. Its totient is φ = 121155401856.

The previous prime is 131251685317. The next prime is 131251685359. The reversal of 131251685357 is 753586152131.

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 25401665641 + 105850019716 = 159379^2 + 325346^2 .

It is a cyclic number.

It is not a de Polignac number, because 131251685357 - 2²⁴ = 131234908141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131251685359) 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, 5048141732 + ... + 5048141757.

It is an arithmetic number, because the mean of its divisors is an integer number (35336992215).

Almost surely, 2^131251685357 is an apocalyptic number.

It is an amenable number.

131251685357 is a deficient number, since it is larger than the sum of its proper divisors (10096283503).

131251685357 is a wasteful number, since it uses less digits than its factorization.

131251685357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10096283502.

The product of its digits is 756000, while the sum is 47.

The spelling of 131251685357 in words is "one hundred thirty-one billion, two hundred fifty-one million, six hundred eighty-five thousand, three hundred fifty-seven".