256121093 has 2 divisors, whose sum is σ = 256121094. Its totient is φ = 256121092.

The previous prime is 256121023. The next prime is 256121111. The reversal of 256121093 is 390121652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181090849 + 75030244 = 13457^2 + 8662^2 .

It is a cyclic number.

It is not a de Polignac number, because 256121093 - 2²² = 251926789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256121023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128060546 + 128060547.

It is an arithmetic number, because the mean of its divisors is an integer number (128060547).

Almost surely, 2^256121093 is an apocalyptic number.

It is an amenable number.

256121093 is a deficient number, since it is larger than the sum of its proper divisors (1).

256121093 is an equidigital number, since it uses as much as digits as its factorization.

256121093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 256121093 is about 16003.7837088609. The cubic root of 256121093 is about 635.0605212327.

The spelling of 256121093 in words is "two hundred fifty-six million, one hundred twenty-one thousand, ninety-three".