157251137 has 4 divisors (see below), whose sum is σ = 162673620. Its totient is φ = 151828656.

The previous prime is 157251121. The next prime is 157251169. The reversal of 157251137 is 731152751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 731152751 = 7 ⋅104450393.

It can be written as a sum of positive squares in 2 ways, for example, as 104121616 + 53129521 = 10204^2 + 7289^2 .

It is a cyclic number.

It is not a de Polignac number, because 157251137 - 2⁴ = 157251121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157253137) 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, 2711198 + ... + 2711255.

It is an arithmetic number, because the mean of its divisors is an integer number (40668405).

Almost surely, 2^157251137 is an apocalyptic number.

It is an amenable number.

157251137 is a deficient number, since it is larger than the sum of its proper divisors (5422483).

157251137 is an equidigital number, since it uses as much as digits as its factorization.

157251137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5422482.

The product of its digits is 7350, while the sum is 32.

The square root of 157251137 is about 12539.9815390614. The cubic root of 157251137 is about 539.7565626548.

The spelling of 157251137 in words is "one hundred fifty-seven million, two hundred fifty-one thousand, one hundred thirty-seven".