157256137 has 4 divisors (see below), whose sum is σ = 166506516. Its totient is φ = 148005760.

The previous prime is 157256123. The next prime is 157256159. The reversal of 157256137 is 731652751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 731652751 = 2389 ⋅306259.

It can be written as a sum of positive squares in 2 ways, for example, as 46185616 + 111070521 = 6796^2 + 10539^2 .

It is a cyclic number.

It is not a de Polignac number, because 157256137 - 2²⁷ = 23038409 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 157256096 and 157256105.

It is not an unprimeable number, because it can be changed into a prime (157256107) 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, 4625164 + ... + 4625197.

It is an arithmetic number, because the mean of its divisors is an integer number (41626629).

Almost surely, 2^157256137 is an apocalyptic number.

157256137 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

157256137 is a deficient number, since it is larger than the sum of its proper divisors (9250379).

157256137 is an equidigital number, since it uses as much as digits as its factorization.

157256137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9250378.

The product of its digits is 44100, while the sum is 37.

The square root of 157256137 is about 12540.1808998116. The cubic root of 157256137 is about 539.7622833431.

The spelling of 157256137 in words is "one hundred fifty-seven million, two hundred fifty-six thousand, one hundred thirty-seven".