256149479 has 2 divisors, whose sum is σ = 256149480. Its totient is φ = 256149478.

The previous prime is 256149473. The next prime is 256149493. The reversal of 256149479 is 974941652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256149479 - 2⁴ = 256149463 is a prime.

It is a super-2 number, since 2×256149479² = 131225111183942882, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256149473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128074739 + 128074740.

It is an arithmetic number, because the mean of its divisors is an integer number (128074740).

Almost surely, 2^256149479 is an apocalyptic number.

256149479 is a deficient number, since it is larger than the sum of its proper divisors (1).

256149479 is an equidigital number, since it uses as much as digits as its factorization.

256149479 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 256149479 is about 16004.6705370651. The cubic root of 256149479 is about 635.0839817005.

The spelling of 256149479 in words is "two hundred fifty-six million, one hundred forty-nine thousand, four hundred seventy-nine".