256033091 has 2 divisors, whose sum is σ = 256033092. Its totient is φ = 256033090.

The previous prime is 256033049. The next prime is 256033109. The reversal of 256033091 is 190330652.

Together with next prime (256033109) 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 256033091 - 2¹⁴ = 256016707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256033891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128016545 + 128016546.

It is an arithmetic number, because the mean of its divisors is an integer number (128016546).

Almost surely, 2^256033091 is an apocalyptic number.

256033091 is a deficient number, since it is larger than the sum of its proper divisors (1).

256033091 is an equidigital number, since it uses as much as digits as its factorization.

256033091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 256033091 is about 16001.0340603350. The cubic root of 256033091 is about 634.9877783003.

The spelling of 256033091 in words is "two hundred fifty-six million, thirty-three thousand, ninety-one".