1256883137 has 2 divisors, whose sum is σ = 1256883138. Its totient is φ = 1256883136.

The previous prime is 1256883107. The next prime is 1256883143. The reversal of 1256883137 is 7313886521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 781817521 + 475065616 = 27961^2 + 21796^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256883137 - 2¹⁰ = 1256882113 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256883107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628441568 + 628441569.

It is an arithmetic number, because the mean of its divisors is an integer number (628441569).

Almost surely, 2^1256883137 is an apocalyptic number.

It is an amenable number.

1256883137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256883137 is an equidigital number, since it uses as much as digits as its factorization.

1256883137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 1256883137 is about 35452.5476799623. The cubic root of 1256883137 is about 1079.1909627388.

The spelling of 1256883137 in words is "one billion, two hundred fifty-six million, eight hundred eighty-three thousand, one hundred thirty-seven".