172042831 has 2 divisors, whose sum is σ = 172042832. Its totient is φ = 172042830.

The previous prime is 172042757. The next prime is 172042883. The reversal of 172042831 is 138240271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172042831 - 2⁹ = 172042319 is a prime.

It is a super-2 number, since 2×172042831² = 59197471396989122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172042831.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172042931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86021415 + 86021416.

It is an arithmetic number, because the mean of its divisors is an integer number (86021416).

Almost surely, 2^172042831 is an apocalyptic number.

172042831 is a deficient number, since it is larger than the sum of its proper divisors (1).

172042831 is an equidigital number, since it uses as much as digits as its factorization.

172042831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 172042831 is about 13116.5098635270. The cubic root of 172042831 is about 556.1759348257.

It can be divided in two parts, 1720 and 42831, that added together give a triangular number (44551 = T₂₉₈).

The spelling of 172042831 in words is "one hundred seventy-two million, forty-two thousand, eight hundred thirty-one".