172617931889 has 8 divisors (see below), whose sum is σ = 186996214440. Its totient is φ = 159339627408.

The previous prime is 172617931841. The next prime is 172617931897. The reversal of 172617931889 is 988139716271.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 93596224225 + 79021707664 = 305935^2 + 281108^2 .

It is not a de Polignac number, because 172617931889 - 2²⁸ = 172349496433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172617931289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39282722 + ... + 39287115.

It is an arithmetic number, because the mean of its divisors is an integer number (23374526805).

Almost surely, 2^172617931889 is an apocalyptic number.

It is an amenable number.

172617931889 is a deficient number, since it is larger than the sum of its proper divisors (14378282551).

172617931889 is an frugal number, since it uses more digits than its factorization.

172617931889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78569876 (or 78569850 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 62.

The spelling of 172617931889 in words is "one hundred seventy-two billion, six hundred seventeen million, nine hundred thirty-one thousand, eight hundred eighty-nine".