216944437 has 2 divisors, whose sum is σ = 216944438. Its totient is φ = 216944436.

The previous prime is 216944419. The next prime is 216944449. The reversal of 216944437 is 734449612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121022001 + 95922436 = 11001^2 + 9794^2 .

It is a cyclic number.

It is not a de Polignac number, because 216944437 - 2²³ = 208555829 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216944437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216944137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108472218 + 108472219.

It is an arithmetic number, because the mean of its divisors is an integer number (108472219).

Almost surely, 2^216944437 is an apocalyptic number.

It is an amenable number.

216944437 is a deficient number, since it is larger than the sum of its proper divisors (1).

216944437 is an equidigital number, since it uses as much as digits as its factorization.

216944437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 216944437 is about 14729.0338108105. The cubic root of 216944437 is about 600.8732072690.

The spelling of 216944437 in words is "two hundred sixteen million, nine hundred forty-four thousand, four hundred thirty-seven".