256464749 has 2 divisors, whose sum is σ = 256464750. Its totient is φ = 256464748.

The previous prime is 256464707. The next prime is 256464757. The reversal of 256464749 is 947464652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249798025 + 6666724 = 15805^2 + 2582^2 .

It is a cyclic number.

It is not a de Polignac number, because 256464749 - 2⁸ = 256464493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256464449) 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 as a sum of consecutive naturals, namely, 128232374 + 128232375.

It is an arithmetic number, because the mean of its divisors is an integer number (128232375).

Almost surely, 2^256464749 is an apocalyptic number.

It is an amenable number.

256464749 is a deficient number, since it is larger than the sum of its proper divisors (1).

256464749 is an equidigital number, since it uses as much as digits as its factorization.

256464749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 47.

The square root of 256464749 is about 16014.5168206849. The cubic root of 256464749 is about 635.3444296737.

The spelling of 256464749 in words is "two hundred fifty-six million, four hundred sixty-four thousand, seven hundred forty-nine".