172122118 has 32 divisors (see below), whose sum is σ = 300168000. Its totient is φ = 72503424.

The previous prime is 172122109. The next prime is 172122149. The reversal of 172122118 is 811221271.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 172122092 and 172122101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 226996 + ... + 227752.

It is an arithmetic number, because the mean of its divisors is an integer number (9380250).

Almost surely, 2^172122118 is an apocalyptic number.

172122118 is a deficient number, since it is larger than the sum of its proper divisors (128045882).

172122118 is a wasteful number, since it uses less digits than its factorization.

172122118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1024.

The product of its digits is 448, while the sum is 25.

The square root of 172122118 is about 13119.5319276261. The cubic root of 172122118 is about 556.2613607409.

Adding to 172122118 its reverse (811221271), we get a palindrome (983343389).

The spelling of 172122118 in words is "one hundred seventy-two million, one hundred twenty-two thousand, one hundred eighteen".