2216537 has 4 divisors (see below), whose sum is σ = 2219700. Its totient is φ = 2213376.

The previous prime is 2216519. The next prime is 2216551. The reversal of 2216537 is 7356122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7356122 = 2 ⋅3678061.

It can be written as a sum of positive squares in 2 ways, for example, as 802816 + 1413721 = 896^2 + 1189^2 .

It is a cyclic number.

It is not a de Polignac number, because 2216537 - 2⁸ = 2216281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2216587) 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, 8 + ... + 2105.

It is an arithmetic number, because the mean of its divisors is an integer number (554925).

2^2216537 is an apocalyptic number.

It is an amenable number.

2216537 is a deficient number, since it is larger than the sum of its proper divisors (3163).

2216537 is a wasteful number, since it uses less digits than its factorization.

2216537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3162.

The product of its digits is 2520, while the sum is 26.

The square root of 2216537 is about 1488.8038823163. The cubic root of 2216537 is about 130.3842085398.

The spelling of 2216537 in words is "two million, two hundred sixteen thousand, five hundred thirty-seven".