255170917 has 2 divisors, whose sum is σ = 255170918. Its totient is φ = 255170916.

The previous prime is 255170899. The next prime is 255170933. The reversal of 255170917 is 719071552.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219958561 + 35212356 = 14831^2 + 5934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-255170917 is a prime.

It is a super-2 number, since 2×255170917² = 130224393765241778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255170957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127585458 + 127585459.

It is an arithmetic number, because the mean of its divisors is an integer number (127585459).

Almost surely, 2^255170917 is an apocalyptic number.

It is an amenable number.

255170917 is a deficient number, since it is larger than the sum of its proper divisors (1).

255170917 is an equidigital number, since it uses as much as digits as its factorization.

255170917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22050, while the sum is 37.

The square root of 255170917 is about 15974.0701450820. The cubic root of 255170917 is about 634.2742173755.

The spelling of 255170917 in words is "two hundred fifty-five million, one hundred seventy thousand, nine hundred seventeen".