172409179931 has 2 divisors, whose sum is σ = 172409179932. Its totient is φ = 172409179930.

The previous prime is 172409179861. The next prime is 172409179961. The reversal of 172409179931 is 139971904271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172409179931 - 2²⁶ = 172342071067 is a prime.

It is a super-2 number, since 2×172409179931² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (172409179961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86204589965 + 86204589966.

It is an arithmetic number, because the mean of its divisors is an integer number (86204589966).

Almost surely, 2^172409179931 is an apocalyptic number.

172409179931 is a deficient number, since it is larger than the sum of its proper divisors (1).

172409179931 is an equidigital number, since it uses as much as digits as its factorization.

172409179931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 53.

The spelling of 172409179931 in words is "one hundred seventy-two billion, four hundred nine million, one hundred seventy-nine thousand, nine hundred thirty-one".