157956191 has 4 divisors (see below), whose sum is σ = 163051584. Its totient is φ = 152860800.

The previous prime is 157956181. The next prime is 157956193. The reversal of 157956191 is 191659751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191659751 = 17 ⋅11274103.

It is a cyclic number.

It is not a de Polignac number, because 157956191 - 2²⁶ = 90847327 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 (157956193) 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, 2547650 + ... + 2547711.

It is an arithmetic number, because the mean of its divisors is an integer number (40762896).

Almost surely, 2^157956191 is an apocalyptic number.

157956191 is a deficient number, since it is larger than the sum of its proper divisors (5095393).

157956191 is an equidigital number, since it uses as much as digits as its factorization.

157956191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5095392.

The product of its digits is 85050, while the sum is 44.

The square root of 157956191 is about 12568.0623407111. The cubic root of 157956191 is about 540.5620474038.

The spelling of 157956191 in words is "one hundred fifty-seven million, nine hundred fifty-six thousand, one hundred ninety-one".