11439999509 has 4 divisors (see below), whose sum is σ = 11937390816. Its totient is φ = 10942608204.

The previous prime is 11439999383. The next prime is 11439999517. The reversal of 11439999509 is 90599993411.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90599993411 = 229 ⋅395633159.

It is a cyclic number.

It is not a de Polignac number, because 11439999509 - 2²⁰ = 11438950933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11439995509) 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, 248695619 + ... + 248695664.

It is an arithmetic number, because the mean of its divisors is an integer number (2984347704).

Almost surely, 2^11439999509 is an apocalyptic number.

It is an amenable number.

11439999509 is a deficient number, since it is larger than the sum of its proper divisors (497391307).

11439999509 is an equidigital number, since it uses as much as digits as its factorization.

11439999509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497391306.

The product of its (nonzero) digits is 3542940, while the sum is 59.

The spelling of 11439999509 in words is "eleven billion, four hundred thirty-nine million, nine hundred ninety-nine thousand, five hundred nine".