2231643 has 4 divisors (see below), whose sum is σ = 2975528. Its totient is φ = 1487760.

The previous prime is 2231627. The next prime is 2231653. The reversal of 2231643 is 3461322.

It is a happy number.

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

It is not a de Polignac number, because 2231643 - 2⁴ = 2231627 is a prime.

It is a super-3 number, since 3×2231643³ = 33342289463547014121, which contains 333 as substring.

It is a d-powerful number, because it can be written as 2 + 2²¹ + 3¹⁰ + 1 + 6 + 4⁷ + 3¹⁰ .

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2231623) 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, 371938 + ... + 371943.

It is an arithmetic number, because the mean of its divisors is an integer number (743882).

2^2231643 is an apocalyptic number.

2231643 is a deficient number, since it is larger than the sum of its proper divisors (743885).

2231643 is an equidigital number, since it uses as much as digits as its factorization.

2231643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743884.

The product of its digits is 864, while the sum is 21.

The square root of 2231643 is about 1493.8684681055. The cubic root of 2231643 is about 130.6797335549.

Adding to 2231643 its reverse (3461322), we get a palindrome (5692965).

The spelling of 2231643 in words is "two million, two hundred thirty-one thousand, six hundred forty-three".