172112157 has 36 divisors (see below), whose sum is σ = 290234880. Its totient is φ = 97996752.

The previous prime is 172112107. The next prime is 172112159. The reversal of 172112157 is 751211271.

It is a de Polignac number, because none of the positive numbers 2^k-172112157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172112157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172112159) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 168394 + ... + 169412.

It is an arithmetic number, because the mean of its divisors is an integer number (8062080).

Almost surely, 2^172112157 is an apocalyptic number.

It is an amenable number.

172112157 is a deficient number, since it is larger than the sum of its proper divisors (118122723).

172112157 is a wasteful number, since it uses less digits than its factorization.

172112157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422 (or 1412 counting only the distinct ones).

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

The square root of 172112157 is about 13119.1522973095. The cubic root of 172112157 is about 556.2506299366.

The spelling of 172112157 in words is "one hundred seventy-two million, one hundred twelve thousand, one hundred fifty-seven".