256761413 has 4 divisors (see below), whose sum is σ = 259855008. Its totient is φ = 253667820.

The previous prime is 256761391. The next prime is 256761433. The reversal of 256761413 is 314167652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256761413 - 2¹⁶ = 256695877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256761433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1546673 + ... + 1546838.

It is an arithmetic number, because the mean of its divisors is an integer number (64963752).

Almost surely, 2^256761413 is an apocalyptic number.

It is an amenable number.

256761413 is a deficient number, since it is larger than the sum of its proper divisors (3093595).

256761413 is an equidigital number, since it uses as much as digits as its factorization.

256761413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3093594.

The product of its digits is 30240, while the sum is 35.

The square root of 256761413 is about 16023.7764899539. The cubic root of 256761413 is about 635.5893121790.

The spelling of 256761413 in words is "two hundred fifty-six million, seven hundred sixty-one thousand, four hundred thirteen".