216582449 has 2 divisors, whose sum is σ = 216582450. Its totient is φ = 216582448.

The previous prime is 216582437. The next prime is 216582491. The reversal of 216582449 is 944285612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179372449 + 37210000 = 13393^2 + 6100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216582449 is a prime.

It is not a weakly prime, because it can be changed into another prime (216582419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108291224 + 108291225.

It is an arithmetic number, because the mean of its divisors is an integer number (108291225).

Almost surely, 2^216582449 is an apocalyptic number.

It is an amenable number.

216582449 is a deficient number, since it is larger than the sum of its proper divisors (1).

216582449 is an equidigital number, since it uses as much as digits as its factorization.

216582449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 41.

The square root of 216582449 is about 14716.7404339412. The cubic root of 216582449 is about 600.5388206054.

The spelling of 216582449 in words is "two hundred sixteen million, five hundred eighty-two thousand, four hundred forty-nine".