172458857 has 2 divisors, whose sum is σ = 172458858. Its totient is φ = 172458856.

The previous prime is 172458851. The next prime is 172458883. The reversal of 172458857 is 758854271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161061481 + 11397376 = 12691^2 + 3376^2 .

It is a cyclic number.

It is not a de Polignac number, because 172458857 - 2⁴ = 172458841 is a prime.

It is not a weakly prime, because it can be changed into another prime (172458851) 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, 86229428 + 86229429.

It is an arithmetic number, because the mean of its divisors is an integer number (86229429).

Almost surely, 2^172458857 is an apocalyptic number.

It is an amenable number.

172458857 is a deficient number, since it is larger than the sum of its proper divisors (1).

172458857 is an equidigital number, since it uses as much as digits as its factorization.

172458857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 627200, while the sum is 47.

The square root of 172458857 is about 13132.3591559171. The cubic root of 172458857 is about 556.6238802418.

The spelling of 172458857 in words is "one hundred seventy-two million, four hundred fifty-eight thousand, eight hundred fifty-seven".