172206631 has 2 divisors, whose sum is σ = 172206632. Its totient is φ = 172206630.

The previous prime is 172206623. The next prime is 172206647. The reversal of 172206631 is 136602271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172206631 - 2³ = 172206623 is a prime.

It is a super-2 number, since 2×172206631² = 59310247520740322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 172206631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172206691) 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 as a sum of consecutive naturals, namely, 86103315 + 86103316.

It is an arithmetic number, because the mean of its divisors is an integer number (86103316).

Almost surely, 2^172206631 is an apocalyptic number.

172206631 is a deficient number, since it is larger than the sum of its proper divisors (1).

172206631 is an equidigital number, since it uses as much as digits as its factorization.

172206631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 172206631 is about 13122.7524170808. The cubic root of 172206631 is about 556.3523884073.

The spelling of 172206631 in words is "one hundred seventy-two million, two hundred six thousand, six hundred thirty-one".