256704451 has 2 divisors, whose sum is σ = 256704452. Its totient is φ = 256704450.

The previous prime is 256704439. The next prime is 256704467. The reversal of 256704451 is 154407652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256704451 - 2⁷ = 256704323 is a prime.

It is a super-2 number, since 2×256704451² = 131794350326422802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256704401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128352225 + 128352226.

It is an arithmetic number, because the mean of its divisors is an integer number (128352226).

Almost surely, 2^256704451 is an apocalyptic number.

256704451 is a deficient number, since it is larger than the sum of its proper divisors (1).

256704451 is an equidigital number, since it uses as much as digits as its factorization.

256704451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33600, while the sum is 34.

The square root of 256704451 is about 16021.9989701660. The cubic root of 256704451 is about 635.5423073018.

The spelling of 256704451 in words is "two hundred fifty-six million, seven hundred four thousand, four hundred fifty-one".