2102309 has 4 divisors (see below), whose sum is σ = 2293440. Its totient is φ = 1911180.

The previous prime is 2102291. The next prime is 2102311. The reversal of 2102309 is 9032012.

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 a de Polignac number, because none of the positive numbers 2^k-2102309 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 (2102329) 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, 95549 + ... + 95570.

It is an arithmetic number, because the mean of its divisors is an integer number (573360).

2^2102309 is an apocalyptic number.

It is an amenable number.

2102309 is a deficient number, since it is larger than the sum of its proper divisors (191131).

2102309 is a wasteful number, since it uses less digits than its factorization.

2102309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191130.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2102309 is about 1449.9341364352. The cubic root of 2102309 is about 128.1048335502.

The spelling of 2102309 in words is "two million, one hundred two thousand, three hundred nine".