157715391 has 4 divisors (see below), whose sum is σ = 210287192. Its totient is φ = 105143592.

The previous prime is 157715381. The next prime is 157715407. The reversal of 157715391 is 193517751.

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

It is not a de Polignac number, because 157715391 - 2⁷ = 157715263 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 (157715381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26285896 + ... + 26285901.

It is an arithmetic number, because the mean of its divisors is an integer number (52571798).

Almost surely, 2^157715391 is an apocalyptic number.

157715391 is a deficient number, since it is larger than the sum of its proper divisors (52571801).

157715391 is an equidigital number, since it uses as much as digits as its factorization.

157715391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52571800.

The product of its digits is 33075, while the sum is 39.

The square root of 157715391 is about 12558.4788489689. The cubic root of 157715391 is about 540.2872168916.

The spelling of 157715391 in words is "one hundred fifty-seven million, seven hundred fifteen thousand, three hundred ninety-one".