1256999063 has 2 divisors, whose sum is σ = 1256999064. Its totient is φ = 1256999062.

The previous prime is 1256999021. The next prime is 1256999069. The reversal of 1256999063 is 3609996521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1256999063 - 2⁶ = 1256998999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256999069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628499531 + 628499532.

It is an arithmetic number, because the mean of its divisors is an integer number (628499532).

Almost surely, 2^1256999063 is an apocalyptic number.

1256999063 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256999063 is an equidigital number, since it uses as much as digits as its factorization.

1256999063 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 787320, while the sum is 50.

The square root of 1256999063 is about 35454.1825882363. The cubic root of 1256999063 is about 1079.2241406962.

The spelling of 1256999063 in words is "one billion, two hundred fifty-six million, nine hundred ninety-nine thousand, sixty-three".