1139956309 has 4 divisors (see below), whose sum is σ = 1146324960. Its totient is φ = 1133587660.

The previous prime is 1139956289. The next prime is 1139956327. The reversal of 1139956309 is 9036599311.

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 1139956309 - 2⁹ = 1139955797 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 (1139956399) 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, 3184057 + ... + 3184414.

It is an arithmetic number, because the mean of its divisors is an integer number (286581240).

Almost surely, 2^1139956309 is an apocalyptic number.

It is an amenable number.

1139956309 is a deficient number, since it is larger than the sum of its proper divisors (6368651).

1139956309 is an equidigital number, since it uses as much as digits as its factorization.

1139956309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6368650.

The product of its (nonzero) digits is 196830, while the sum is 46.

The square root of 1139956309 is about 33763.2390181985. The cubic root of 1139956309 is about 1044.6305811729.

The spelling of 1139956309 in words is "one billion, one hundred thirty-nine million, nine hundred fifty-six thousand, three hundred nine".