2131309 has 8 divisors (see below), whose sum is σ = 2199168. Its totient is φ = 2064480.

The previous prime is 2131291. The next prime is 2131319. The reversal of 2131309 is 9031312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2131309 - 2¹¹ = 2129261 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 (2131319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6274 + ... + 6604.

It is an arithmetic number, because the mean of its divisors is an integer number (274896).

2^2131309 is an apocalyptic number.

It is an amenable number.

2131309 is a deficient number, since it is larger than the sum of its proper divisors (67859).

2131309 is a wasteful number, since it uses less digits than its factorization.

2131309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 2131309 is about 1459.9003390643. The cubic root of 2131309 is about 128.6911868875.

The spelling of 2131309 in words is "two million, one hundred thirty-one thousand, three hundred nine".