3138321709 has 4 divisors (see below), whose sum is σ = 3138439360. Its totient is φ = 3138204060.

The previous prime is 3138321707. The next prime is 3138321721. The reversal of 3138321709 is 9071238313.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3138321709 - 2¹ = 3138321707 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 (3138321707) 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, 2494 + ... + 79264.

It is an arithmetic number, because the mean of its divisors is an integer number (784609840).

Almost surely, 2^3138321709 is an apocalyptic number.

It is an amenable number.

3138321709 is a deficient number, since it is larger than the sum of its proper divisors (117651).

3138321709 is an equidigital number, since it uses as much as digits as its factorization.

3138321709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117650.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 3138321709 is about 56020.7257093301. The cubic root of 3138321709 is about 1464.0834127191.

The spelling of 3138321709 in words is "three billion, one hundred thirty-eight million, three hundred twenty-one thousand, seven hundred nine".