2221631 has 2 divisors, whose sum is σ = 2221632. Its totient is φ = 2221630.

The previous prime is 2221589. The next prime is 2221633. The reversal of 2221631 is 1361222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2221631 - 2⁶ = 2221567 is a prime.

It is a super-2 number, since 2×2221631² = 9871288600322, which contains 22 as substring.

Together with 2221633, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110815 + 1110816.

It is an arithmetic number, because the mean of its divisors is an integer number (1110816).

2^2221631 is an apocalyptic number.

2221631 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221631 is an equidigital number, since it uses as much as digits as its factorization.

2221631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 17.

The square root of 2221631 is about 1490.5136698467. The cubic root of 2221631 is about 130.4840142288.

Adding to 2221631 its reverse (1361222), we get a palindrome (3582853).

The spelling of 2221631 in words is "two million, two hundred twenty-one thousand, six hundred thirty-one".