172970657 has 2 divisors, whose sum is σ = 172970658. Its totient is φ = 172970656.

The previous prime is 172970647. The next prime is 172970719. The reversal of 172970657 is 756079271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 162205696 + 10764961 = 12736^2 + 3281^2 .

It is a cyclic number.

It is not a de Polignac number, because 172970657 - 2⁶ = 172970593 is a prime.

It is not a weakly prime, because it can be changed into another prime (172970647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86485328 + 86485329.

It is an arithmetic number, because the mean of its divisors is an integer number (86485329).

Almost surely, 2^172970657 is an apocalyptic number.

It is an amenable number.

172970657 is a deficient number, since it is larger than the sum of its proper divisors (1).

172970657 is an equidigital number, since it uses as much as digits as its factorization.

172970657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185220, while the sum is 44.

The square root of 172970657 is about 13151.8309371737. The cubic root of 172970657 is about 557.1739607287.

The spelling of 172970657 in words is "one hundred seventy-two million, nine hundred seventy thousand, six hundred fifty-seven".