2109431 has 4 divisors (see below), whose sum is σ = 2182200. Its totient is φ = 2036664.

The previous prime is 2109421. The next prime is 2109449. The reversal of 2109431 is 1349012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2109431 is a prime.

It is a super-2 number, since 2×2109431² = 8899398287522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2109421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36341 + ... + 36398.

It is an arithmetic number, because the mean of its divisors is an integer number (545550).

2^2109431 is an apocalyptic number.

2109431 is a deficient number, since it is larger than the sum of its proper divisors (72769).

2109431 is an equidigital number, since it uses as much as digits as its factorization.

2109431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72768.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 2109431 is about 1452.3880335503. The cubic root of 2109431 is about 128.2493309081.

The spelling of 2109431 in words is "two million, one hundred nine thousand, four hundred thirty-one".