2231509 has 6 divisors (see below), whose sum is σ = 2595894. Its totient is φ = 1912680.

The previous prime is 2231501. The next prime is 2231519. The reversal of 2231509 is 9051322.

It can be written as a sum of positive squares in only one way, i.e., 1416100 + 815409 = 1190^2 + 903^2 .

It is not a de Polignac number, because 2231509 - 2³ = 2231501 is a prime.

It is a super-3 number, since 3×2231509³ = 33336283666224015687, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2231509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2231501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22722 + ... + 22819.

It is an arithmetic number, because the mean of its divisors is an integer number (432649).

2^2231509 is an apocalyptic number.

It is an amenable number.

2231509 is a deficient number, since it is larger than the sum of its proper divisors (364385).

2231509 is an equidigital number, since it uses as much as digits as its factorization.

2231509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45555 (or 45548 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 2231509 is about 1493.8236174328. The cubic root of 2231509 is about 130.6771179282.

The spelling of 2231509 in words is "two million, two hundred thirty-one thousand, five hundred nine".