256447349 has 2 divisors, whose sum is σ = 256447350. Its totient is φ = 256447348.

The previous prime is 256447307. The next prime is 256447357. The reversal of 256447349 is 943744652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166539025 + 89908324 = 12905^2 + 9482^2 .

It is a cyclic number.

It is not a de Polignac number, because 256447349 - 2¹⁶ = 256381813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256447049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128223674 + 128223675.

It is an arithmetic number, because the mean of its divisors is an integer number (128223675).

Almost surely, 2^256447349 is an apocalyptic number.

It is an amenable number.

256447349 is a deficient number, since it is larger than the sum of its proper divisors (1).

256447349 is an equidigital number, since it uses as much as digits as its factorization.

256447349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 44.

The square root of 256447349 is about 16013.9735543681. The cubic root of 256447349 is about 635.3300609114.

The spelling of 256447349 in words is "two hundred fifty-six million, four hundred forty-seven thousand, three hundred forty-nine".