256297747 has 2 divisors, whose sum is σ = 256297748. Its totient is φ = 256297746.

The previous prime is 256297733. The next prime is 256297757. The reversal of 256297747 is 747792652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256297747 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256297747.

It is not a weakly prime, because it can be changed into another prime (256297757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128148873 + 128148874.

It is an arithmetic number, because the mean of its divisors is an integer number (128148874).

Almost surely, 2^256297747 is an apocalyptic number.

256297747 is a deficient number, since it is larger than the sum of its proper divisors (1).

256297747 is an equidigital number, since it uses as much as digits as its factorization.

256297747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1481760, while the sum is 49.

The square root of 256297747 is about 16009.3018898389. The cubic root of 256297747 is about 635.2064941099.

The spelling of 256297747 in words is "two hundred fifty-six million, two hundred ninety-seven thousand, seven hundred forty-seven".