256554751 has 2 divisors, whose sum is σ = 256554752. Its totient is φ = 256554750.

The previous prime is 256554731. The next prime is 256554761. The reversal of 256554751 is 157455652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256554751 - 2⁹ = 256554239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256554721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128277375 + 128277376.

It is an arithmetic number, because the mean of its divisors is an integer number (128277376).

Almost surely, 2^256554751 is an apocalyptic number.

256554751 is a deficient number, since it is larger than the sum of its proper divisors (1).

256554751 is an equidigital number, since it uses as much as digits as its factorization.

256554751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 210000, while the sum is 40.

The square root of 256554751 is about 16017.3265871680. The cubic root of 256554751 is about 635.4187421369.

Subtracting from 256554751 its reverse (157455652), we obtain a palindrome (99099099).

The spelling of 256554751 in words is "two hundred fifty-six million, five hundred fifty-four thousand, seven hundred fifty-one".