1220776279 has 2 divisors, whose sum is σ = 1220776280. Its totient is φ = 1220776278.

The previous prime is 1220776253. The next prime is 1220776283. The reversal of 1220776279 is 9726770221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220776279 - 2⁹ = 1220775767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220776229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610388139 + 610388140.

It is an arithmetic number, because the mean of its divisors is an integer number (610388140).

Almost surely, 2^1220776279 is an apocalyptic number.

1220776279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220776279 is an equidigital number, since it uses as much as digits as its factorization.

1220776279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176, while the sum is 43.

The square root of 1220776279 is about 34939.6090275779. The cubic root of 1220776279 is about 1068.7563152095.

The spelling of 1220776279 in words is "one billion, two hundred twenty million, seven hundred seventy-six thousand, two hundred seventy-nine".