1256894377 has 2 divisors, whose sum is σ = 1256894378. Its totient is φ = 1256894376.

The previous prime is 1256894341. The next prime is 1256894393. The reversal of 1256894377 is 7734986521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 873557136 + 383337241 = 29556^2 + 19579^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256894377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256894077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628447188 + 628447189.

It is an arithmetic number, because the mean of its divisors is an integer number (628447189).

Almost surely, 2^1256894377 is an apocalyptic number.

It is an amenable number.

1256894377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256894377 is an equidigital number, since it uses as much as digits as its factorization.

1256894377 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 52.

The square root of 1256894377 is about 35452.7062013607. The cubic root of 1256894377 is about 1079.1941797100.

The spelling of 1256894377 in words is "one billion, two hundred fifty-six million, eight hundred ninety-four thousand, three hundred seventy-seven".