157214991 has 4 divisors (see below), whose sum is σ = 209619992. Its totient is φ = 104809992.

The previous prime is 157214983. The next prime is 157215001. The reversal of 157214991 is 199412751.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 199412751 = 3 ⋅66470917.

It is not a de Polignac number, because 157214991 - 2³ = 157214983 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 (157215991) 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, 26202496 + ... + 26202501.

It is an arithmetic number, because the mean of its divisors is an integer number (52404998).

Almost surely, 2^157214991 is an apocalyptic number.

157214991 is a deficient number, since it is larger than the sum of its proper divisors (52405001).

157214991 is an equidigital number, since it uses as much as digits as its factorization.

157214991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52405000.

The product of its digits is 22680, while the sum is 39.

The square root of 157214991 is about 12538.5402260391. The cubic root of 157214991 is about 539.7152030476.

The spelling of 157214991 in words is "one hundred fifty-seven million, two hundred fourteen thousand, nine hundred ninety-one".