172136231 has 4 divisors (see below), whose sum is σ = 175798752. Its totient is φ = 168473712.

The previous prime is 172136207. The next prime is 172136243. The reversal of 172136231 is 132631271.

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 172136231 - 2²⁶ = 105027367 is a prime.

It is a super-2 number, since 2×172136231² = 59261764045770722, 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 172136231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172136201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1831190 + ... + 1831283.

It is an arithmetic number, because the mean of its divisors is an integer number (43949688).

Almost surely, 2^172136231 is an apocalyptic number.

172136231 is a deficient number, since it is larger than the sum of its proper divisors (3662521).

172136231 is an equidigital number, since it uses as much as digits as its factorization.

172136231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3662520.

The product of its digits is 1512, while the sum is 26.

The square root of 172136231 is about 13120.0697787779. The cubic root of 172136231 is about 556.2765637106.

The spelling of 172136231 in words is "one hundred seventy-two million, one hundred thirty-six thousand, two hundred thirty-one".