172239084917 has 2 divisors, whose sum is σ = 172239084918. Its totient is φ = 172239084916.

The previous prime is 172239084889. The next prime is 172239084967. The reversal of 172239084917 is 719480932271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122546204356 + 49692880561 = 350066^2 + 222919^2 .

It is a cyclic number.

It is not a de Polignac number, because 172239084917 - 2¹⁸ = 172238822773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172239084967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86119542458 + 86119542459.

It is an arithmetic number, because the mean of its divisors is an integer number (86119542459).

Almost surely, 2^172239084917 is an apocalyptic number.

It is an amenable number.

172239084917 is a deficient number, since it is larger than the sum of its proper divisors (1).

172239084917 is an equidigital number, since it uses as much as digits as its factorization.

172239084917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 53.

The spelling of 172239084917 in words is "one hundred seventy-two billion, two hundred thirty-nine million, eighty-four thousand, nine hundred seventeen".