172858731613 has 2 divisors, whose sum is σ = 172858731614. Its totient is φ = 172858731612.

The previous prime is 172858731599. The next prime is 172858731631. The reversal of 172858731613 is 316137858271.

Together with next prime (172858731631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153141516889 + 19717214724 = 391333^2 + 140418^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172858731613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172858731653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86429365806 + 86429365807.

It is an arithmetic number, because the mean of its divisors is an integer number (86429365807).

Almost surely, 2^172858731613 is an apocalyptic number.

It is an amenable number.

172858731613 is a deficient number, since it is larger than the sum of its proper divisors (1).

172858731613 is an equidigital number, since it uses as much as digits as its factorization.

172858731613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 52.

The spelling of 172858731613 in words is "one hundred seventy-two billion, eight hundred fifty-eight million, seven hundred thirty-one thousand, six hundred thirteen".