172505017 has 2 divisors, whose sum is σ = 172505018. Its totient is φ = 172505016.

The previous prime is 172504979. The next prime is 172505027. The reversal of 172505017 is 710505271.

172505017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167469481 + 5035536 = 12941^2 + 2244^2 .

It is a cyclic number.

It is not a de Polignac number, because 172505017 - 2¹⁵ = 172472249 is a prime.

It is not a weakly prime, because it can be changed into another prime (172505027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86252508 + 86252509.

It is an arithmetic number, because the mean of its divisors is an integer number (86252509).

Almost surely, 2^172505017 is an apocalyptic number.

It is an amenable number.

172505017 is a deficient number, since it is larger than the sum of its proper divisors (1).

172505017 is an equidigital number, since it uses as much as digits as its factorization.

172505017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 172505017 is about 13134.1165291008. The cubic root of 172505017 is about 556.6735374310.

The spelling of 172505017 in words is "one hundred seventy-two million, five hundred five thousand, seventeen".