157138391 has 4 divisors (see below), whose sum is σ = 157215984. Its totient is φ = 157060800.

The previous prime is 157138337. The next prime is 157138427. The reversal of 157138391 is 193831751.

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

It is a cyclic number.

It is not a de Polignac number, because 157138391 - 2¹⁰ = 157137367 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 (157138321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35675 + ... + 39836.

It is an arithmetic number, because the mean of its divisors is an integer number (39303996).

Almost surely, 2^157138391 is an apocalyptic number.

157138391 is a deficient number, since it is larger than the sum of its proper divisors (77593).

157138391 is an equidigital number, since it uses as much as digits as its factorization.

157138391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77592.

The product of its digits is 22680, while the sum is 38.

The square root of 157138391 is about 12535.4852718194. The cubic root of 157138391 is about 539.6275335013.

The spelling of 157138391 in words is "one hundred fifty-seven million, one hundred thirty-eight thousand, three hundred ninety-one".