1256958839 has 2 divisors, whose sum is σ = 1256958840. Its totient is φ = 1256958838.

The previous prime is 1256958827. The next prime is 1256958893. The reversal of 1256958839 is 9388596521.

Together with next prime (1256958893) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256958839 - 2⁴ = 1256958823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256958139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628479419 + 628479420.

It is an arithmetic number, because the mean of its divisors is an integer number (628479420).

Almost surely, 2^1256958839 is an apocalyptic number.

1256958839 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256958839 is an equidigital number, since it uses as much as digits as its factorization.

1256958839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 56.

The square root of 1256958839 is about 35453.6153163538. The cubic root of 1256958839 is about 1079.2126288407.

The spelling of 1256958839 in words is "one billion, two hundred fifty-six million, nine hundred fifty-eight thousand, eight hundred thirty-nine".