2431309 has 4 divisors (see below), whose sum is σ = 2435004. Its totient is φ = 2427616.

The previous prime is 2431301. The next prime is 2431321. The reversal of 2431309 is 9031342.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1108809 + 1322500 = 1053^2 + 1150^2 .

It is a cyclic number.

It is not a de Polignac number, because 2431309 - 2³ = 2431301 is a prime.

It is a super-2 number, since 2×2431309² = 11822526906962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2431309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2431301) 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, 562 + ... + 2275.

It is an arithmetic number, because the mean of its divisors is an integer number (608751).

2^2431309 is an apocalyptic number.

It is an amenable number.

2431309 is a deficient number, since it is larger than the sum of its proper divisors (3695).

2431309 is an equidigital number, since it uses as much as digits as its factorization.

2431309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 2431309 is about 1559.2655322298. The cubic root of 2431309 is about 134.4662786346.

The spelling of 2431309 in words is "two million, four hundred thirty-one thousand, three hundred nine".