1256045377 has 2 divisors, whose sum is σ = 1256045378. Its totient is φ = 1256045376.

The previous prime is 1256045363. The next prime is 1256045447. The reversal of 1256045377 is 7735406521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1000077376 + 255968001 = 31624^2 + 15999^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256045377 - 2¹⁹ = 1255521089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256042377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628022688 + 628022689.

It is an arithmetic number, because the mean of its divisors is an integer number (628022689).

Almost surely, 2^1256045377 is an apocalyptic number.

It is an amenable number.

1256045377 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256045377 is an equidigital number, since it uses as much as digits as its factorization.

1256045377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 176400, while the sum is 40.

The square root of 1256045377 is about 35440.7304806207. The cubic root of 1256045377 is about 1078.9511356243.

The spelling of 1256045377 in words is "one billion, two hundred fifty-six million, forty-five thousand, three hundred seventy-seven".