1226643409 has 2 divisors, whose sum is σ = 1226643410. Its totient is φ = 1226643408.

The previous prime is 1226643359. The next prime is 1226643427. The reversal of 1226643409 is 9043466221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1206867600 + 19775809 = 34740^2 + 4447^2 .

It is an emirp because it is prime and its reverse (9043466221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1226643409 - 2⁷ = 1226643281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1226643469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613321704 + 613321705.

It is an arithmetic number, because the mean of its divisors is an integer number (613321705).

Almost surely, 2^1226643409 is an apocalyptic number.

It is an amenable number.

1226643409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226643409 is an equidigital number, since it uses as much as digits as its factorization.

1226643409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 1226643409 is about 35023.4694026734. The cubic root of 1226643409 is about 1070.4657503057.

The spelling of 1226643409 in words is "one billion, two hundred twenty-six million, six hundred forty-three thousand, four hundred nine".