816256213 has 2 divisors, whose sum is σ = 816256214. Its totient is φ = 816256212.

The previous prime is 816256211. The next prime is 816256247. The reversal of 816256213 is 312652618.

It is an a-pointer prime, because the next prime (816256247) can be obtained adding 816256213 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 777405924 + 38850289 = 27882^2 + 6233^2 .

It is a cyclic number.

It is not a de Polignac number, because 816256213 - 2¹ = 816256211 is a prime.

It is a super-2 number, since 2×816256213² = 1332548410522202738, which contains 22 as substring.

Together with 816256211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816256211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408128106 + 408128107.

It is an arithmetic number, because the mean of its divisors is an integer number (408128107).

Almost surely, 2^816256213 is an apocalyptic number.

It is an amenable number.

816256213 is a deficient number, since it is larger than the sum of its proper divisors (1).

816256213 is an equidigital number, since it uses as much as digits as its factorization.

816256213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 816256213 is about 28570.1979867134. The cubic root of 816256213 is about 934.5635386523.

The spelling of 816256213 in words is "eight hundred sixteen million, two hundred fifty-six thousand, two hundred thirteen".