255173939 has 2 divisors, whose sum is σ = 255173940. Its totient is φ = 255173938.

The previous prime is 255173917. The next prime is 255173953. The reversal of 255173939 is 939371552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255173939 - 2²⁰ = 254125363 is a prime.

It is a super-2 number, since 2×255173939² = 130227478289551442, 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 255173939.

It is not a weakly prime, because it can be changed into another prime (255173839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127586969 + 127586970.

It is an arithmetic number, because the mean of its divisors is an integer number (127586970).

Almost surely, 2^255173939 is an apocalyptic number.

255173939 is a deficient number, since it is larger than the sum of its proper divisors (1).

255173939 is an equidigital number, since it uses as much as digits as its factorization.

255173939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 255150, while the sum is 44.

The square root of 255173939 is about 15974.1647355973. The cubic root of 255173939 is about 634.2767212778.

The spelling of 255173939 in words is "two hundred fifty-five million, one hundred seventy-three thousand, nine hundred thirty-nine".