1255784879 has 4 divisors (see below), whose sum is σ = 1321878840. Its totient is φ = 1189690920.

The previous prime is 1255784861. The next prime is 1255784891. The reversal of 1255784879 is 9784875521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9784875521 = 17 ⋅575580913.

It is a cyclic number.

It is not a de Polignac number, because 1255784879 - 2⁸ = 1255784623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1255784899) 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 in 3 ways as a sum of consecutive naturals, for example, 33046952 + ... + 33046989.

It is an arithmetic number, because the mean of its divisors is an integer number (330469710).

Almost surely, 2^1255784879 is an apocalyptic number.

1255784879 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1255784879 is a deficient number, since it is larger than the sum of its proper divisors (66093961).

1255784879 is an equidigital number, since it uses as much as digits as its factorization.

1255784879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66093960.

The product of its digits is 5644800, while the sum is 56.

The square root of 1255784879 is about 35437.0551682839. The cubic root of 1255784879 is about 1078.8765406426.

The spelling of 1255784879 in words is "one billion, two hundred fifty-five million, seven hundred eighty-four thousand, eight hundred seventy-nine".