256766539 has 2 divisors, whose sum is σ = 256766540. Its totient is φ = 256766538.

The previous prime is 256766527. The next prime is 256766557. The reversal of 256766539 is 935667652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256766539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256766492 and 256766501.

It is not a weakly prime, because it can be changed into another prime (256766339) 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, 128383269 + 128383270.

It is an arithmetic number, because the mean of its divisors is an integer number (128383270).

Almost surely, 2^256766539 is an apocalyptic number.

256766539 is a deficient number, since it is larger than the sum of its proper divisors (1).

256766539 is an equidigital number, since it uses as much as digits as its factorization.

256766539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 49.

The square root of 256766539 is about 16023.9364389653. The cubic root of 256766539 is about 635.5935417983.

The spelling of 256766539 in words is "two hundred fifty-six million, seven hundred sixty-six thousand, five hundred thirty-nine".