1220656427 has 2 divisors, whose sum is σ = 1220656428. Its totient is φ = 1220656426.

The previous prime is 1220656379. The next prime is 1220656453. The reversal of 1220656427 is 7246560221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1220656427 - 2²² = 1216462123 is a prime.

It is a super-2 number, since 2×1220656427² = 2980004225552812658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1220650427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610328213 + 610328214.

It is an arithmetic number, because the mean of its divisors is an integer number (610328214).

Almost surely, 2^1220656427 is an apocalyptic number.

1220656427 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220656427 is an equidigital number, since it uses as much as digits as its factorization.

1220656427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 35.

The square root of 1220656427 is about 34937.8938546673. The cubic root of 1220656427 is about 1068.7213383465.

The spelling of 1220656427 in words is "one billion, two hundred twenty million, six hundred fifty-six thousand, four hundred twenty-seven".