1299120039509 has 4 divisors (see below), whose sum is σ = 1299294261804. Its totient is φ = 1298945817216.

The previous prime is 1299120039493. The next prime is 1299120039523. The reversal of 1299120039509 is 9059300219921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 338921908900 + 960198130609 = 582170^2 + 979897^2 .

It is a cyclic number.

It is not a de Polignac number, because 1299120039509 - 2⁴ = 1299120039493 is a prime.

It is a super-2 number, since 2×1299120039509² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299120038509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87099962 + ... + 87114875.

It is an arithmetic number, because the mean of its divisors is an integer number (324823565451).

Almost surely, 2^{1299120039509} is an apocalyptic number.

It is an amenable number.

1299120039509 is a deficient number, since it is larger than the sum of its proper divisors (174222295).

1299120039509 is an equidigital number, since it uses as much as digits as its factorization.

1299120039509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174222294.

The product of its (nonzero) digits is 393660, while the sum is 50.

The spelling of 1299120039509 in words is "one trillion, two hundred ninety-nine billion, one hundred twenty million, thirty-nine thousand, five hundred nine".