172930831 has 2 divisors, whose sum is σ = 172930832. Its totient is φ = 172930830.

The previous prime is 172930811. The next prime is 172930843. The reversal of 172930831 is 138039271.

It is a strong prime.

It is an emirp because it is prime and its reverse (138039271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172930831 - 2²¹ = 170833679 is a prime.

It is a super-2 number, since 2×172930831² = 59810144620701122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172930811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86465415 + 86465416.

It is an arithmetic number, because the mean of its divisors is an integer number (86465416).

Almost surely, 2^172930831 is an apocalyptic number.

172930831 is a deficient number, since it is larger than the sum of its proper divisors (1).

172930831 is an equidigital number, since it uses as much as digits as its factorization.

172930831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 172930831 is about 13150.3167642456. The cubic root of 172930831 is about 557.1311948750.

The spelling of 172930831 in words is "one hundred seventy-two million, nine hundred thirty thousand, eight hundred thirty-one".