216364249 has 2 divisors, whose sum is σ = 216364250. Its totient is φ = 216364248.

The previous prime is 216364217. The next prime is 216364277. The reversal of 216364249 is 942463612.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173396224 + 42968025 = 13168^2 + 6555^2 .

It is a cyclic number.

It is not a de Polignac number, because 216364249 - 2⁵ = 216364217 is a prime.

It is not a weakly prime, because it can be changed into another prime (216364279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108182124 + 108182125.

It is an arithmetic number, because the mean of its divisors is an integer number (108182125).

Almost surely, 2^216364249 is an apocalyptic number.

It is an amenable number.

216364249 is a deficient number, since it is larger than the sum of its proper divisors (1).

216364249 is an equidigital number, since it uses as much as digits as its factorization.

216364249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 37.

The square root of 216364249 is about 14709.3252394527. The cubic root of 216364249 is about 600.3370781876.

The spelling of 216364249 in words is "two hundred sixteen million, three hundred sixty-four thousand, two hundred forty-nine".