157172551 has 4 divisors (see below), whose sum is σ = 158113872. Its totient is φ = 156231232.

The previous prime is 157172549. The next prime is 157172567. The reversal of 157172551 is 155271751.

157172551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155271751 = 911 ⋅170441.

It is a cyclic number.

It is not a de Polignac number, because 157172551 - 2¹ = 157172549 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 (157172581) 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, 470410 + ... + 470743.

It is an arithmetic number, because the mean of its divisors is an integer number (39528468).

Almost surely, 2^157172551 is an apocalyptic number.

157172551 is a deficient number, since it is larger than the sum of its proper divisors (941321).

157172551 is an equidigital number, since it uses as much as digits as its factorization.

157172551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 941320.

The product of its digits is 12250, while the sum is 34.

The square root of 157172551 is about 12536.8477297924. The cubic root of 157172551 is about 539.6666335177. Note that the first 4 decimals are identical.

The spelling of 157172551 in words is "one hundred fifty-seven million, one hundred seventy-two thousand, five hundred fifty-one".