1299795509 has 4 divisors (see below), whose sum is σ = 1318102560. Its totient is φ = 1281488460.

The previous prime is 1299795499. The next prime is 1299795517. The reversal of 1299795509 is 9055979921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1299795509 - 2⁸ = 1299795253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299795589) 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 3 ways as a sum of consecutive naturals, for example, 9153419 + ... + 9153560.

It is an arithmetic number, because the mean of its divisors is an integer number (329525640).

Almost surely, 2^1299795509 is an apocalyptic number.

It is an amenable number.

1299795509 is a deficient number, since it is larger than the sum of its proper divisors (18307051).

1299795509 is an equidigital number, since it uses as much as digits as its factorization.

1299795509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18307050.

The product of its (nonzero) digits is 2296350, while the sum is 56.

The square root of 1299795509 is about 36052.6768631679. The cubic root of 1299795509 is about 1091.3356544136.

The spelling of 1299795509 in words is "one billion, two hundred ninety-nine million, seven hundred ninety-five thousand, five hundred nine".