1261482779 has 2 divisors, whose sum is σ = 1261482780. Its totient is φ = 1261482778.

The previous prime is 1261482749. The next prime is 1261482791. The reversal of 1261482779 is 9772841621.

It is a strong prime.

It is an emirp because it is prime and its reverse (9772841621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261482779 - 2²⁸ = 993047323 is a prime.

It is not a weakly prime, because it can be changed into another prime (1261482749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630741389 + 630741390.

It is an arithmetic number, because the mean of its divisors is an integer number (630741390).

Almost surely, 2^1261482779 is an apocalyptic number.

1261482779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261482779 is an equidigital number, since it uses as much as digits as its factorization.

1261482779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 47.

The square root of 1261482779 is about 35517.3588404318. The cubic root of 1261482779 is about 1080.5058155917.

The spelling of 1261482779 in words is "one billion, two hundred sixty-one million, four hundred eighty-two thousand, seven hundred seventy-nine".