1320377569 has 27 divisors (see below), whose sum is σ = 1599675987. Its totient is φ = 1086621648.

The previous prime is 1320377549. The next prime is 1320377609. The reversal of 1320377569 is 9657730231.

It is a happy number.

The square root of 1320377569 is 36337.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 692373969 + 628003600 = 26313^2 + 25060^2 .

It is not a de Polignac number, because 1320377569 - 2⁷ = 1320377441 is a prime.

It is a super-2 number, since 2×1320377569² = 3486793849436699522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1320377549) 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 in 26 ways as a sum of consecutive naturals, for example, 7376322 + ... + 7376500.

Almost surely, 2^1320377569 is an apocalyptic number.

1320377569 is the 36337-th square number.

1320377569 is the 18169-th centered octagonal number.

It is an amenable number.

1320377569 is a deficient number, since it is larger than the sum of its proper divisors (279298418).

1320377569 is an frugal number, since it uses more digits than its factorization.

1320377569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 43.

The cubic root of 1320377569 is about 1097.0658910676.

The spelling of 1320377569 in words is "one billion, three hundred twenty million, three hundred seventy-seven thousand, five hundred sixty-nine".