2231645 has 24 divisors (see below), whose sum is σ = 3074400. Its totient is φ = 1550016.

The previous prime is 2231627. The next prime is 2231653. The reversal of 2231645 is 5461322.

It is not a de Polignac number, because 2231645 - 2⁸ = 2231389 is a prime.

It is a super-3 number, since 3×2231645³ = 33342379107775983375, which contains 333 as substring.

It is a d-powerful number, because it can be written as 2¹⁷ + 2²¹ + 3⁵ + 1 + 6² + 4² + 5⁵ .

It is a self number, because there is not a number n which added to its sum of digits gives 2231645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15986 + ... + 16124.

It is an arithmetic number, because the mean of its divisors is an integer number (128100).

2^2231645 is an apocalyptic number.

It is an amenable number.

2231645 is a deficient number, since it is larger than the sum of its proper divisors (842755).

2231645 is a wasteful number, since it uses less digits than its factorization.

2231645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 176 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 2231645 is about 1493.8691375084. The cubic root of 2231645 is about 130.6797725933.

Adding to 2231645 its reverse (5461322), we get a palindrome (7692967).

The spelling of 2231645 in words is "two million, two hundred thirty-one thousand, six hundred forty-five".