1323311989 has 2 divisors, whose sum is σ = 1323311990. Its totient is φ = 1323311988.

The previous prime is 1323311959. The next prime is 1323312007. The reversal of 1323311989 is 9891133231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 715295025 + 608016964 = 26745^2 + 24658^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323311989 - 2⁷ = 1323311861 is a prime.

It is a super-2 number, since 2×1323311989² = 3502309240462272242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1323311929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661655994 + 661655995.

It is an arithmetic number, because the mean of its divisors is an integer number (661655995).

Almost surely, 2^1323311989 is an apocalyptic number.

It is an amenable number.

1323311989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323311989 is an equidigital number, since it uses as much as digits as its factorization.

1323311989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 40.

The square root of 1323311989 is about 36377.3554426377. The cubic root of 1323311989 is about 1097.8779997339.

The spelling of 1323311989 in words is "one billion, three hundred twenty-three million, three hundred eleven thousand, nine hundred eighty-nine".