1239911713 has 4 divisors (see below), whose sum is σ = 1241581248. Its totient is φ = 1238242180.

The previous prime is 1239911683. The next prime is 1239911719. The reversal of 1239911713 is 3171199321.

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: 3171199321 = 277 ⋅11448373.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1239911713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1239911719) 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, 833653 + ... + 835138.

It is an arithmetic number, because the mean of its divisors is an integer number (310395312).

Almost surely, 2^1239911713 is an apocalyptic number.

It is an amenable number.

1239911713 is a deficient number, since it is larger than the sum of its proper divisors (1669535).

1239911713 is an equidigital number, since it uses as much as digits as its factorization.

1239911713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669534.

The product of its digits is 10206, while the sum is 37.

The square root of 1239911713 is about 35212.3801098420. The cubic root of 1239911713 is about 1074.3115730728.

The spelling of 1239911713 in words is "one billion, two hundred thirty-nine million, nine hundred eleven thousand, seven hundred thirteen".