2187217 has 2 divisors, whose sum is σ = 2187218. Its totient is φ = 2187216.

The previous prime is 2187197. The next prime is 2187233. The reversal of 2187217 is 7127812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2099601 + 87616 = 1449^2 + 296^2 .

It is a cyclic number.

It is not a de Polignac number, because 2187217 - 2¹⁹ = 1662929 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2187247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1093608 + 1093609.

It is an arithmetic number, because the mean of its divisors is an integer number (1093609).

2^2187217 is an apocalyptic number.

It is an amenable number.

2187217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2187217 is an equidigital number, since it uses as much as digits as its factorization.

2187217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1568, while the sum is 28.

The square root of 2187217 is about 1478.9242712188. The cubic root of 2187217 is about 129.8067543017.

The spelling of 2187217 in words is "two million, one hundred eighty-seven thousand, two hundred seventeen".