172112831 has 4 divisors (see below), whose sum is σ = 187759464. Its totient is φ = 156466200.

The previous prime is 172112821. The next prime is 172112833. The reversal of 172112831 is 138211271.

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

It is a de Polignac number, because none of the positive numbers 2^k-172112831 is a prime.

It is a super-2 number, since 2×172112831² = 59245653189669122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172112831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172112833) 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, 7823300 + ... + 7823321.

It is an arithmetic number, because the mean of its divisors is an integer number (46939866).

Almost surely, 2^172112831 is an apocalyptic number.

172112831 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

172112831 is a deficient number, since it is larger than the sum of its proper divisors (15646633).

172112831 is a wasteful number, since it uses less digits than its factorization.

172112831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15646632.

The product of its digits is 672, while the sum is 26.

The square root of 172112831 is about 13119.1779849196. The cubic root of 172112831 is about 556.2513560376.

The spelling of 172112831 in words is "one hundred seventy-two million, one hundred twelve thousand, eight hundred thirty-one".