2220631 has 6 divisors (see below), whose sum is σ = 2583240. Its totient is φ = 1903356.

The previous prime is 2220553. The next prime is 2220643. The reversal of 2220631 is 1360222.

2220631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2220631 - 2⁷ = 2220503 is a prime.

It is a super-2 number, since 2×2220631² = 9862404076322, which contains 22 as substring.

It is a Duffinian number.

2220631 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22611 + ... + 22708.

It is an arithmetic number, because the mean of its divisors is an integer number (430540).

2^2220631 is an apocalyptic number.

2220631 is a deficient number, since it is larger than the sum of its proper divisors (362609).

2220631 is an equidigital number, since it uses as much as digits as its factorization.

2220631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45333 (or 45326 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 2220631 is about 1490.1781772661. The cubic root of 2220631 is about 130.4644334798.

Adding to 2220631 its reverse (1360222), we get a palindrome (3580853).

The spelling of 2220631 in words is "two million, two hundred twenty thousand, six hundred thirty-one".