1320998069 has 2 divisors, whose sum is σ = 1320998070. Its totient is φ = 1320998068.

The previous prime is 1320998051. The next prime is 1320998099. The reversal of 1320998069 is 9608990231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1117564900 + 203433169 = 33430^2 + 14263^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320998069 - 2²⁰ = 1319949493 is a prime.

It is a super-2 number, since 2×1320998069² = 3490071796603457522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320998099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660499034 + 660499035.

It is an arithmetic number, because the mean of its divisors is an integer number (660499035).

Almost surely, 2^1320998069 is an apocalyptic number.

It is an amenable number.

1320998069 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320998069 is an equidigital number, since it uses as much as digits as its factorization.

1320998069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 47.

The square root of 1320998069 is about 36345.5371263103. The cubic root of 1320998069 is about 1097.2377163583.

The spelling of 1320998069 in words is "one billion, three hundred twenty million, nine hundred ninety-eight thousand, sixty-nine".