1255977779 has 16 divisors (see below), whose sum is σ = 1458681600. Its totient is φ = 1059135264.

The previous prime is 1255977773. The next prime is 1255977797. The reversal of 1255977779 is 9777795521.

It is a cyclic number.

It is not a de Polignac number, because 1255977779 - 2⁴ = 1255977763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1255977773) 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 15 ways as a sum of consecutive naturals, for example, 575312 + ... + 577490.

It is an arithmetic number, because the mean of its divisors is an integer number (91167600).

Almost surely, 2^1255977779 is an apocalyptic number.

1255977779 is a deficient number, since it is larger than the sum of its proper divisors (202703821).

1255977779 is a wasteful number, since it uses less digits than its factorization.

1255977779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3482.

The product of its digits is 9724050, while the sum is 59.

The square root of 1255977779 is about 35439.7767910578. The cubic root of 1255977779 is about 1078.9317795700.

The spelling of 1255977779 in words is "one billion, two hundred fifty-five million, nine hundred seventy-seven thousand, seven hundred seventy-nine".