1320631969 has 2 divisors, whose sum is σ = 1320631970. Its totient is φ = 1320631968.

The previous prime is 1320631937. The next prime is 1320631999. The reversal of 1320631969 is 9691360231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 883278400 + 437353569 = 29720^2 + 20913^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320631969 - 2⁵ = 1320631937 is a prime.

It is a super-2 number, since 2×1320631969² = 3488137595089633922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1320631919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660315984 + 660315985.

It is an arithmetic number, because the mean of its divisors is an integer number (660315985).

Almost surely, 2^1320631969 is an apocalyptic number.

It is an amenable number.

1320631969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320631969 is an equidigital number, since it uses as much as digits as its factorization.

1320631969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 1320631969 is about 36340.5003955642. The cubic root of 1320631969 is about 1097.1363445618.

The spelling of 1320631969 in words is "one billion, three hundred twenty million, six hundred thirty-one thousand, nine hundred sixty-nine".