1256132791 has 2 divisors, whose sum is σ = 1256132792. Its totient is φ = 1256132790.

The previous prime is 1256132777. The next prime is 1256132809. The reversal of 1256132791 is 1972316521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256132791 - 2¹⁵ = 1256100023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1256132791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256132711) 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, 628066395 + 628066396.

It is an arithmetic number, because the mean of its divisors is an integer number (628066396).

Almost surely, 2^1256132791 is an apocalyptic number.

1256132791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256132791 is an equidigital number, since it uses as much as digits as its factorization.

1256132791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 37.

The square root of 1256132791 is about 35441.9637012398. The cubic root of 1256132791 is about 1078.9761647749.

The spelling of 1256132791 in words is "one billion, two hundred fifty-six million, one hundred thirty-two thousand, seven hundred ninety-one".