172517242831 has 2 divisors, whose sum is σ = 172517242832. Its totient is φ = 172517242830.

The previous prime is 172517242759. The next prime is 172517242841. The reversal of 172517242831 is 138242715271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172517242831 - 2¹⁷ = 172517111759 is a prime.

It is a super-2 number, since 2×172517242831² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172517242841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86258621415 + 86258621416.

It is an arithmetic number, because the mean of its divisors is an integer number (86258621416).

Almost surely, 2^172517242831 is an apocalyptic number.

172517242831 is a deficient number, since it is larger than the sum of its proper divisors (1).

172517242831 is an equidigital number, since it uses as much as digits as its factorization.

172517242831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188160, while the sum is 43.

The spelling of 172517242831 in words is "one hundred seventy-two billion, five hundred seventeen million, two hundred forty-two thousand, eight hundred thirty-one".