1256012755 has 4 divisors (see below), whose sum is σ = 1507215312. Its totient is φ = 1004810200.

The previous prime is 1256012743. The next prime is 1256012761. The reversal of 1256012755 is 5572106521.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1256012755 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1256012755.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125601271 + ... + 125601280.

It is an arithmetic number, because the mean of its divisors is an integer number (376803828).

Almost surely, 2^1256012755 is an apocalyptic number.

1256012755 is a deficient number, since it is larger than the sum of its proper divisors (251202557).

1256012755 is an equidigital number, since it uses as much as digits as its factorization.

1256012755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251202556.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 1256012755 is about 35440.2702444550. The cubic root of 1256012755 is about 1078.9417947068.

The spelling of 1256012755 in words is "one billion, two hundred fifty-six million, twelve thousand, seven hundred fifty-five".