256385093 has 2 divisors, whose sum is σ = 256385094. Its totient is φ = 256385092.

The previous prime is 256385089. The next prime is 256385111. The reversal of 256385093 is 390583652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 185858689 + 70526404 = 13633^2 + 8398^2 .

It is a cyclic number.

It is not a de Polignac number, because 256385093 - 2² = 256385089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256385093.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256385023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128192546 + 128192547.

It is an arithmetic number, because the mean of its divisors is an integer number (128192547).

Almost surely, 2^256385093 is an apocalyptic number.

It is an amenable number.

256385093 is a deficient number, since it is larger than the sum of its proper divisors (1).

256385093 is an equidigital number, since it uses as much as digits as its factorization.

256385093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 41.

The square root of 256385093 is about 16012.0296339971. The cubic root of 256385093 is about 635.2786451470.

The spelling of 256385093 in words is "two hundred fifty-six million, three hundred eighty-five thousand, ninety-three".