255247891 has 2 divisors, whose sum is σ = 255247892. Its totient is φ = 255247890.

The previous prime is 255247819. The next prime is 255247897. The reversal of 255247891 is 198742552.

Together with previous prime (255247819) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255247891 - 2¹¹ = 255245843 is a prime.

It is not a weakly prime, because it can be changed into another prime (255247897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127623945 + 127623946.

It is an arithmetic number, because the mean of its divisors is an integer number (127623946).

Almost surely, 2^255247891 is an apocalyptic number.

255247891 is a deficient number, since it is larger than the sum of its proper divisors (1).

255247891 is an equidigital number, since it uses as much as digits as its factorization.

255247891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 43.

The square root of 255247891 is about 15976.4793055291. The cubic root of 255247891 is about 634.3379886388.

The spelling of 255247891 in words is "two hundred fifty-five million, two hundred forty-seven thousand, eight hundred ninety-one".