157921297 has 4 divisors (see below), whose sum is σ = 158050816. Its totient is φ = 157791780.

The previous prime is 157921273. The next prime is 157921319. The reversal of 157921297 is 792129751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157921297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (157921207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62913 + ... + 65374.

It is an arithmetic number, because the mean of its divisors is an integer number (39512704).

Almost surely, 2^157921297 is an apocalyptic number.

It is an amenable number.

157921297 is a deficient number, since it is larger than the sum of its proper divisors (129519).

157921297 is a wasteful number, since it uses less digits than its factorization.

157921297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129518.

The product of its digits is 79380, while the sum is 43.

The square root of 157921297 is about 12566.6740627741. The cubic root of 157921297 is about 540.5222394016.

The spelling of 157921297 in words is "one hundred fifty-seven million, nine hundred twenty-one thousand, two hundred ninety-seven".