172591173023 has 2 divisors, whose sum is σ = 172591173024. Its totient is φ = 172591173022.

The previous prime is 172591173017. The next prime is 172591173043. The reversal of 172591173023 is 320371195271.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172591173023 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172591173043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86295586511 + 86295586512.

It is an arithmetic number, because the mean of its divisors is an integer number (86295586512).

Almost surely, 2^172591173023 is an apocalyptic number.

172591173023 is a deficient number, since it is larger than the sum of its proper divisors (1).

172591173023 is an equidigital number, since it uses as much as digits as its factorization.

172591173023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 79380, while the sum is 41.

The spelling of 172591173023 in words is "one hundred seventy-two billion, five hundred ninety-one million, one hundred seventy-three thousand, twenty-three".