1220775379 has 2 divisors, whose sum is σ = 1220775380. Its totient is φ = 1220775378.

The previous prime is 1220775359. The next prime is 1220775407. The reversal of 1220775379 is 9735770221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1220775379 - 2¹¹ = 1220773331 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220775359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610387689 + 610387690.

It is an arithmetic number, because the mean of its divisors is an integer number (610387690).

Almost surely, 2^1220775379 is an apocalyptic number.

1220775379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220775379 is an equidigital number, since it uses as much as digits as its factorization.

1220775379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185220, while the sum is 43.

The square root of 1220775379 is about 34939.5961482098. The cubic root of 1220775379 is about 1068.7560525677.

The spelling of 1220775379 in words is "one billion, two hundred twenty million, seven hundred seventy-five thousand, three hundred seventy-nine".