2216729 has 2 divisors, whose sum is σ = 2216730. Its totient is φ = 2216728.

The previous prime is 2216701. The next prime is 2216743. The reversal of 2216729 is 9276122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1651225 + 565504 = 1285^2 + 752^2 .

It is a cyclic number.

It is not a de Polignac number, because 2216729 - 2¹² = 2212633 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2216759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1108364 + 1108365.

It is an arithmetic number, because the mean of its divisors is an integer number (1108365).

2^2216729 is an apocalyptic number.

It is an amenable number.

2216729 is a deficient number, since it is larger than the sum of its proper divisors (1).

2216729 is an equidigital number, since it uses as much as digits as its factorization.

2216729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 2216729 is about 1488.8683622134. The cubic root of 2216729 is about 130.3879731277.

The spelling of 2216729 in words is "two million, two hundred sixteen thousand, seven hundred twenty-nine".