256654319 has 2 divisors, whose sum is σ = 256654320. Its totient is φ = 256654318.

The previous prime is 256654291. The next prime is 256654339. The reversal of 256654319 is 913456652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256654319 - 2²⁰ = 255605743 is a prime.

It is a super-2 number, since 2×256654319² = 131742878922707522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256654339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128327159 + 128327160.

It is an arithmetic number, because the mean of its divisors is an integer number (128327160).

Almost surely, 2^256654319 is an apocalyptic number.

256654319 is a deficient number, since it is larger than the sum of its proper divisors (1).

256654319 is an equidigital number, since it uses as much as digits as its factorization.

256654319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 41.

The square root of 256654319 is about 16020.4344198277. The cubic root of 256654319 is about 635.5009327677.

The spelling of 256654319 in words is "two hundred fifty-six million, six hundred fifty-four thousand, three hundred nineteen".