256743451 has 2 divisors, whose sum is σ = 256743452. Its totient is φ = 256743450.

The previous prime is 256743439. The next prime is 256743463. The reversal of 256743451 is 154347652.

It is a balanced prime because it is at equal distance from previous prime (256743439) and next prime (256743463).

It is a cyclic number.

It is not a de Polignac number, because 256743451 - 2⁹ = 256742939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256743451.

It is not a weakly prime, because it can be changed into another prime (256743491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128371725 + 128371726.

It is an arithmetic number, because the mean of its divisors is an integer number (128371726).

Almost surely, 2^256743451 is an apocalyptic number.

256743451 is a deficient number, since it is larger than the sum of its proper divisors (1).

256743451 is an equidigital number, since it uses as much as digits as its factorization.

256743451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 37.

The square root of 256743451 is about 16023.2160005412. The cubic root of 256743451 is about 635.5744907392.

It can be divided in two parts, 25 and 6743451, that added together give a palindrome (6743476).

The spelling of 256743451 in words is "two hundred fifty-six million, seven hundred forty-three thousand, four hundred fifty-one".