255850891 has 2 divisors, whose sum is σ = 255850892. Its totient is φ = 255850890.

The previous prime is 255850849. The next prime is 255850913. The reversal of 255850891 is 198058552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255850891 - 2²¹ = 253753739 is a prime.

It is not a weakly prime, because it can be changed into another prime (255850801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127925445 + 127925446.

It is an arithmetic number, because the mean of its divisors is an integer number (127925446).

Almost surely, 2^255850891 is an apocalyptic number.

255850891 is a deficient number, since it is larger than the sum of its proper divisors (1).

255850891 is an equidigital number, since it uses as much as digits as its factorization.

255850891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144000, while the sum is 43.

The square root of 255850891 is about 15995.3396650399. The cubic root of 255850891 is about 634.8371177907.

The spelling of 255850891 in words is "two hundred fifty-five million, eight hundred fifty thousand, eight hundred ninety-one".