256349399 has 2 divisors, whose sum is σ = 256349400. Its totient is φ = 256349398.

The previous prime is 256349383. The next prime is 256349411. The reversal of 256349399 is 993943652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256349399 - 2⁴ = 256349383 is a prime.

It is a super-2 number, since 2×256349399² = 131430028735322402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256342399) 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, 128174699 + 128174700.

It is an arithmetic number, because the mean of its divisors is an integer number (128174700).

Almost surely, 2^256349399 is an apocalyptic number.

256349399 is a deficient number, since it is larger than the sum of its proper divisors (1).

256349399 is an equidigital number, since it uses as much as digits as its factorization.

256349399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1574640, while the sum is 50.

The square root of 256349399 is about 16010.9149957146. The cubic root of 256349399 is about 635.2491625588.

The spelling of 256349399 in words is "two hundred fifty-six million, three hundred forty-nine thousand, three hundred ninety-nine".