1244220409 has 2 divisors, whose sum is σ = 1244220410. Its totient is φ = 1244220408.

The previous prime is 1244220407. The next prime is 1244220427. The reversal of 1244220409 is 9040224421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1230045184 + 14175225 = 35072^2 + 3765^2 .

It is a cyclic number.

It is not a de Polignac number, because 1244220409 - 2¹ = 1244220407 is a prime.

Together with 1244220407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1244220403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622110204 + 622110205.

It is an arithmetic number, because the mean of its divisors is an integer number (622110205).

Almost surely, 2^1244220409 is an apocalyptic number.

It is an amenable number.

1244220409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1244220409 is an equidigital number, since it uses as much as digits as its factorization.

1244220409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 1244220409 is about 35273.5086006482. The cubic root of 1244220409 is about 1075.5545461180.

The spelling of 1244220409 in words is "one billion, two hundred forty-four million, two hundred twenty thousand, four hundred nine".