157931513 has 8 divisors (see below), whose sum is σ = 167391432. Its totient is φ = 148490496.

The previous prime is 157931509. The next prime is 157931519. The reversal of 157931513 is 315139751.

It can be written as a sum of positive squares in 4 ways, for example, as 47513449 + 110418064 = 6893^2 + 10508^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 157931513 - 2² = 157931509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (157931519) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14831 + ... + 23147.

It is an arithmetic number, because the mean of its divisors is an integer number (20923929).

Almost surely, 2^157931513 is an apocalyptic number.

It is an amenable number.

157931513 is a deficient number, since it is larger than the sum of its proper divisors (9459919).

157931513 is a wasteful number, since it uses less digits than its factorization.

157931513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9451.

The product of its digits is 14175, while the sum is 35.

The square root of 157931513 is about 12567.0805281099. The cubic root of 157931513 is about 540.5338946928.

The spelling of 157931513 in words is "one hundred fifty-seven million, nine hundred thirty-one thousand, five hundred thirteen".