1321011409 has 2 divisors, whose sum is σ = 1321011410. Its totient is φ = 1321011408.

The previous prime is 1321011397. The next prime is 1321011437. The reversal of 1321011409 is 9041101231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 720761409 + 600250000 = 26847^2 + 24500^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321011409 - 2⁹ = 1321010897 is a prime.

It is a super-2 number, since 2×1321011409² = 3490142285416330562, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321011409.

It is not a weakly prime, because it can be changed into another prime (1321011449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660505704 + 660505705.

It is an arithmetic number, because the mean of its divisors is an integer number (660505705).

Almost surely, 2^1321011409 is an apocalyptic number.

It is an amenable number.

1321011409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321011409 is an equidigital number, since it uses as much as digits as its factorization.

1321011409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 1321011409 is about 36345.7206421884. The cubic root of 1321011409 is about 1097.2414098035.

The spelling of 1321011409 in words is "one billion, three hundred twenty-one million, eleven thousand, four hundred nine".