2216631 has 4 divisors (see below), whose sum is σ = 2955512. Its totient is φ = 1477752.

The previous prime is 2216629. The next prime is 2216653. The reversal of 2216631 is 1366122.

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 2216631 - 2¹ = 2216629 is a prime.

It is a super-2 number, since 2×2216631² = 9826905980322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2216598 and 2216607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2216611) 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, 369436 + ... + 369441.

It is an arithmetic number, because the mean of its divisors is an integer number (738878).

2^2216631 is an apocalyptic number.

2216631 is a deficient number, since it is larger than the sum of its proper divisors (738881).

2216631 is an equidigital number, since it uses as much as digits as its factorization.

2216631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738880.

The product of its digits is 432, while the sum is 21.

The square root of 2216631 is about 1488.8354509482. The cubic root of 2216631 is about 130.3860516464.

It can be divided in two parts, 22 and 16631, that added together give a triangular number (16653 = T₁₈₂).

The spelling of 2216631 in words is "two million, two hundred sixteen thousand, six hundred thirty-one".