216562349 has 2 divisors, whose sum is σ = 216562350. Its totient is φ = 216562348.

The previous prime is 216562331. The next prime is 216562351. The reversal of 216562349 is 943265612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155800324 + 60762025 = 12482^2 + 7795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216562349 is a prime.

Together with 216562351, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216561349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108281174 + 108281175.

It is an arithmetic number, because the mean of its divisors is an integer number (108281175).

Almost surely, 2^216562349 is an apocalyptic number.

It is an amenable number.

216562349 is a deficient number, since it is larger than the sum of its proper divisors (1).

216562349 is an equidigital number, since it uses as much as digits as its factorization.

216562349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The square root of 216562349 is about 14716.0575223121. The cubic root of 216562349 is about 600.5202423014.

The spelling of 216562349 in words is "two hundred sixteen million, five hundred sixty-two thousand, three hundred forty-nine".