172123331 has 4 divisors (see below), whose sum is σ = 172236000. Its totient is φ = 172010664.

The previous prime is 172123319. The next prime is 172123349. The reversal of 172123331 is 133321271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172123331 - 2⁶ = 172123267 is a prime.

It is a super-2 number, since 2×172123331² = 59252882149071122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172123297 and 172123306.

It is not an unprimeable number, because it can be changed into a prime (172123361) 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, 54011 + ... + 57108.

It is an arithmetic number, because the mean of its divisors is an integer number (43059000).

Almost surely, 2^172123331 is an apocalyptic number.

172123331 is a deficient number, since it is larger than the sum of its proper divisors (112669).

172123331 is a wasteful number, since it uses less digits than its factorization.

172123331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112668.

The product of its digits is 756, while the sum is 23.

The square root of 172123331 is about 13119.5781563280. The cubic root of 172123331 is about 556.2626674555.

It can be divided in two parts, 1721 and 23331, that added together give a palindrome (25052).

The spelling of 172123331 in words is "one hundred seventy-two million, one hundred twenty-three thousand, three hundred thirty-one".