256413049 has 2 divisors, whose sum is σ = 256413050. Its totient is φ = 256413048.

The previous prime is 256413007. The next prime is 256413061. The reversal of 256413049 is 940314652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253287225 + 3125824 = 15915^2 + 1768^2 .

It is a cyclic number.

It is not a de Polignac number, because 256413049 - 2⁹ = 256412537 is a prime.

It is not a weakly prime, because it can be changed into another prime (256413089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128206524 + 128206525.

It is an arithmetic number, because the mean of its divisors is an integer number (128206525).

Almost surely, 2^256413049 is an apocalyptic number.

It is an amenable number.

256413049 is a deficient number, since it is larger than the sum of its proper divisors (1).

256413049 is an equidigital number, since it uses as much as digits as its factorization.

256413049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 256413049 is about 16012.9025788581. The cubic root of 256413049 is about 635.3017343786.

The spelling of 256413049 in words is "two hundred fifty-six million, four hundred thirteen thousand, forty-nine".