255891091 has 2 divisors, whose sum is σ = 255891092. Its totient is φ = 255891090.

The previous prime is 255891079. The next prime is 255891113. The reversal of 255891091 is 190198552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255891091 - 2⁵ = 255891059 is a prime.

It is not a weakly prime, because it can be changed into another prime (255891011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127945545 + 127945546.

It is an arithmetic number, because the mean of its divisors is an integer number (127945546).

Almost surely, 2^255891091 is an apocalyptic number.

255891091 is a deficient number, since it is larger than the sum of its proper divisors (1).

255891091 is an equidigital number, since it uses as much as digits as its factorization.

255891091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 40.

The square root of 255891091 is about 15996.5962316988. The cubic root of 255891091 is about 634.8703651711.

The spelling of 255891091 in words is "two hundred fifty-five million, eight hundred ninety-one thousand, ninety-one".