216512249 has 2 divisors, whose sum is σ = 216512250. Its totient is φ = 216512248.

The previous prime is 216512243. The next prime is 216512269. The reversal of 216512249 is 942215612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 187005625 + 29506624 = 13675^2 + 5432^2 .

It is a cyclic number.

It is not a de Polignac number, because 216512249 - 2¹² = 216508153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216512243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108256124 + 108256125.

It is an arithmetic number, because the mean of its divisors is an integer number (108256125).

Almost surely, 2^216512249 is an apocalyptic number.

It is an amenable number.

216512249 is a deficient number, since it is larger than the sum of its proper divisors (1).

216512249 is an equidigital number, since it uses as much as digits as its factorization.

216512249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 216512249 is about 14714.3552016390. The cubic root of 216512249 is about 600.4739301814.

The spelling of 216512249 in words is "two hundred sixteen million, five hundred twelve thousand, two hundred forty-nine".