1220576813 has 2 divisors, whose sum is σ = 1220576814. Its totient is φ = 1220576812.

The previous prime is 1220576809. The next prime is 1220576839. The reversal of 1220576813 is 3186750221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1211944969 + 8631844 = 34813^2 + 2938^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220576813 - 2² = 1220576809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220576843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610288406 + 610288407.

It is an arithmetic number, because the mean of its divisors is an integer number (610288407).

Almost surely, 2^1220576813 is an apocalyptic number.

It is an amenable number.

1220576813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220576813 is an equidigital number, since it uses as much as digits as its factorization.

1220576813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1220576813 is about 34936.7544714732. The cubic root of 1220576813 is about 1068.6981030259.

The spelling of 1220576813 in words is "one billion, two hundred twenty million, five hundred seventy-six thousand, eight hundred thirteen".