1220220409 has 2 divisors, whose sum is σ = 1220220410. Its totient is φ = 1220220408.

The previous prime is 1220220401. The next prime is 1220220437. The reversal of 1220220409 is 9040220221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1138860009 + 81360400 = 33747^2 + 9020^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220220409 - 2³ = 1220220401 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220220409.

It is not a weakly prime, because it can be changed into another prime (1220220401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610110204 + 610110205.

It is an arithmetic number, because the mean of its divisors is an integer number (610110205).

Almost surely, 2^1220220409 is an apocalyptic number.

It is an amenable number.

1220220409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220220409 is an equidigital number, since it uses as much as digits as its factorization.

1220220409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1220220409 is about 34931.6533963109. The cubic root of 1220220409 is about 1068.5940742439.

The spelling of 1220220409 in words is "one billion, two hundred twenty million, two hundred twenty thousand, four hundred nine".