256490323 has 2 divisors, whose sum is σ = 256490324. Its totient is φ = 256490322.

The previous prime is 256490317. The next prime is 256490359. The reversal of 256490323 is 323094652.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256490323 is a prime.

It is not a weakly prime, because it can be changed into another prime (256490303) 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, 128245161 + 128245162.

It is an arithmetic number, because the mean of its divisors is an integer number (128245162).

Almost surely, 2^256490323 is an apocalyptic number.

256490323 is a deficient number, since it is larger than the sum of its proper divisors (1).

256490323 is an equidigital number, since it uses as much as digits as its factorization.

256490323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 34.

The square root of 256490323 is about 16015.3152638342. The cubic root of 256490323 is about 635.3655472717.

The spelling of 256490323 in words is "two hundred fifty-six million, four hundred ninety thousand, three hundred twenty-three".