1320431249 has 2 divisors, whose sum is σ = 1320431250. Its totient is φ = 1320431248.

The previous prime is 1320431179. The next prime is 1320431251. The reversal of 1320431249 is 9421340231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1002165649 + 318265600 = 31657^2 + 17840^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320431249 - 2¹² = 1320427153 is a prime.

Together with 1320431251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1320401249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660215624 + 660215625.

It is an arithmetic number, because the mean of its divisors is an integer number (660215625).

Almost surely, 2^1320431249 is an apocalyptic number.

It is an amenable number.

1320431249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320431249 is an equidigital number, since it uses as much as digits as its factorization.

1320431249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 1320431249 is about 36337.7386335474. The cubic root of 1320431249 is about 1097.0807579513.

The spelling of 1320431249 in words is "one billion, three hundred twenty million, four hundred thirty-one thousand, two hundred forty-nine".