1220286857 has 2 divisors, whose sum is σ = 1220286858. Its totient is φ = 1220286856.

The previous prime is 1220286841. The next prime is 1220286889. The reversal of 1220286857 is 7586820221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 879478336 + 340808521 = 29656^2 + 18461^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220286857 - 2⁴ = 1220286841 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220286817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610143428 + 610143429.

It is an arithmetic number, because the mean of its divisors is an integer number (610143429).

Almost surely, 2^1220286857 is an apocalyptic number.

It is an amenable number.

1220286857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220286857 is an equidigital number, since it uses as much as digits as its factorization.

1220286857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 1220286857 is about 34932.6044978041. The cubic root of 1220286857 is about 1068.6134709173.

The spelling of 1220286857 in words is "one billion, two hundred twenty million, two hundred eighty-six thousand, eight hundred fifty-seven".