1256939275 has 12 divisors (see below), whose sum is σ = 1560329200. Its totient is φ = 1004438880.

The previous prime is 1256939273. The next prime is 1256939287. The reversal of 1256939275 is 5729396521.

It is not a de Polignac number, because 1256939275 - 2¹ = 1256939273 is a prime.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1256939273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4380 + ... + 50329.

Almost surely, 2^1256939275 is an apocalyptic number.

1256939275 is a deficient number, since it is larger than the sum of its proper divisors (303389925).

1256939275 is an equidigital number, since it uses as much as digits as its factorization.

1256939275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55638 (or 55633 counting only the distinct ones).

The product of its digits is 1020600, while the sum is 49.

The square root of 1256939275 is about 35453.3394054777. The cubic root of 1256939275 is about 1079.2070296583.

The spelling of 1256939275 in words is "one billion, two hundred fifty-six million, nine hundred thirty-nine thousand, two hundred seventy-five".