172608257 has 2 divisors, whose sum is σ = 172608258. Its totient is φ = 172608256.

The previous prime is 172608253. The next prime is 172608269. The reversal of 172608257 is 752806271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92756161 + 79852096 = 9631^2 + 8936^2 .

It is a cyclic number.

It is not a de Polignac number, because 172608257 - 2² = 172608253 is a prime.

It is a super-2 number, since 2×172608257² = 59587220769156098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 172608257.

It is not a weakly prime, because it can be changed into another prime (172608253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86304128 + 86304129.

It is an arithmetic number, because the mean of its divisors is an integer number (86304129).

Almost surely, 2^172608257 is an apocalyptic number.

It is an amenable number.

172608257 is a deficient number, since it is larger than the sum of its proper divisors (1).

172608257 is an equidigital number, since it uses as much as digits as its factorization.

172608257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 172608257 is about 13138.0461637186. The cubic root of 172608257 is about 556.7845670807.

The spelling of 172608257 in words is "one hundred seventy-two million, six hundred eight thousand, two hundred fifty-seven".