1320634669 has 2 divisors, whose sum is σ = 1320634670. Its totient is φ = 1320634668.

The previous prime is 1320634657. The next prime is 1320634687. The reversal of 1320634669 is 9664360231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 798740644 + 521894025 = 28262^2 + 22845^2 .

It is an emirp because it is prime and its reverse (9664360231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320634669 - 2¹³ = 1320626477 is a prime.

It is a super-2 number, since 2×1320634669² = 3488151857929479122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320644669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660317334 + 660317335.

It is an arithmetic number, because the mean of its divisors is an integer number (660317335).

Almost surely, 2^1320634669 is an apocalyptic number.

It is an amenable number.

1320634669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320634669 is an equidigital number, since it uses as much as digits as its factorization.

1320634669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 1320634669 is about 36340.5375441806. The cubic root of 1320634669 is about 1097.1370922508.

The spelling of 1320634669 in words is "one billion, three hundred twenty million, six hundred thirty-four thousand, six hundred sixty-nine".