1320579899 has 4 divisors (see below), whose sum is σ = 1323561336. Its totient is φ = 1317598464.

The previous prime is 1320579833. The next prime is 1320579917. The reversal of 1320579899 is 9989750231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9989750231 = 6221 ⋅1605811.

It is a cyclic number.

It is not a de Polignac number, because 1320579899 - 2⁸ = 1320579643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1320579899.

It is not an unprimeable number, because it can be changed into a prime (1320579829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1490054 + ... + 1490939.

It is an arithmetic number, because the mean of its divisors is an integer number (330890334).

Almost surely, 2^1320579899 is an apocalyptic number.

1320579899 is a deficient number, since it is larger than the sum of its proper divisors (2981437).

1320579899 is an equidigital number, since it uses as much as digits as its factorization.

1320579899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2981436.

The product of its (nonzero) digits is 1224720, while the sum is 53.

The square root of 1320579899 is about 36339.7839701889. The cubic root of 1320579899 is about 1097.1219250410.

The spelling of 1320579899 in words is "one billion, three hundred twenty million, five hundred seventy-nine thousand, eight hundred ninety-nine".