216423313 has 2 divisors, whose sum is σ = 216423314. Its totient is φ = 216423312.

The previous prime is 216423301. The next prime is 216423349. The reversal of 216423313 is 313324612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124032769 + 92390544 = 11137^2 + 9612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216423313 is a prime.

It is not a weakly prime, because it can be changed into another prime (216420313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108211656 + 108211657.

It is an arithmetic number, because the mean of its divisors is an integer number (108211657).

Almost surely, 2^216423313 is an apocalyptic number.

It is an amenable number.

216423313 is a deficient number, since it is larger than the sum of its proper divisors (1).

216423313 is an equidigital number, since it uses as much as digits as its factorization.

216423313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 25.

The square root of 216423313 is about 14711.3328084168. The cubic root of 216423313 is about 600.3917007101.

Adding to 216423313 its reverse (313324612), we get a palindrome (529747925).

The spelling of 216423313 in words is "two hundred sixteen million, four hundred twenty-three thousand, three hundred thirteen".