172130431091 has 2 divisors, whose sum is σ = 172130431092. Its totient is φ = 172130431090.

The previous prime is 172130431013. The next prime is 172130431097. The reversal of 172130431091 is 190134031271.

It is a strong prime.

It is an emirp because it is prime and its reverse (190134031271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172130431091 - 2²⁶ = 172063322227 is a prime.

It is not a weakly prime, because it can be changed into another prime (172130431097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86065215545 + 86065215546.

It is an arithmetic number, because the mean of its divisors is an integer number (86065215546).

Almost surely, 2^172130431091 is an apocalyptic number.

172130431091 is a deficient number, since it is larger than the sum of its proper divisors (1).

172130431091 is an equidigital number, since it uses as much as digits as its factorization.

172130431091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 32.

The spelling of 172130431091 in words is "one hundred seventy-two billion, one hundred thirty million, four hundred thirty-one thousand, ninety-one".