157122171 has 6 divisors (see below), whose sum is σ = 226954260. Its totient is φ = 104748108.

The previous prime is 157122151. The next prime is 157122181. The reversal of 157122171 is 171221751.

157122171 is a `hidden beast` number, since 1 + 571 + 2 + 21 + 71 = 666.

It is not a de Polignac number, because 157122171 - 2⁶ = 157122107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (157122151) 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 5 ways as a sum of consecutive naturals, for example, 8729001 + ... + 8729018.

It is an arithmetic number, because the mean of its divisors is an integer number (37825710).

Almost surely, 2^157122171 is an apocalyptic number.

157122171 is a deficient number, since it is larger than the sum of its proper divisors (69832089).

157122171 is a wasteful number, since it uses less digits than its factorization.

157122171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17458025 (or 17458022 counting only the distinct ones).

The product of its digits is 980, while the sum is 27.

The square root of 157122171 is about 12534.8382917372. The cubic root of 157122171 is about 539.6089658772.

The spelling of 157122171 in words is "one hundred fifty-seven million, one hundred twenty-two thousand, one hundred seventy-one".