256426003 has 2 divisors, whose sum is σ = 256426004. Its totient is φ = 256426002.

The previous prime is 256425997. The next prime is 256426007. The reversal of 256426003 is 300624652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256426003 - 2¹⁷ = 256294931 is a prime.

It is a super-3 number, since 3×256426003³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (256426007) 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, 128213001 + 128213002.

It is an arithmetic number, because the mean of its divisors is an integer number (128213002).

Almost surely, 2^256426003 is an apocalyptic number.

256426003 is a deficient number, since it is larger than the sum of its proper divisors (1).

256426003 is an equidigital number, since it uses as much as digits as its factorization.

256426003 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 256426003 is about 16013.3070600673. The cubic root of 256426003 is about 635.3124326902.

The spelling of 256426003 in words is "two hundred fifty-six million, four hundred twenty-six thousand, three".