816390833 has 2 divisors, whose sum is σ = 816390834. Its totient is φ = 816390832.

The previous prime is 816390787. The next prime is 816390863. The reversal of 816390833 is 338093618.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 466214464 + 350176369 = 21592^2 + 18713^2 .

It is a cyclic number.

It is not a de Polignac number, because 816390833 - 2¹⁸ = 816128689 is a prime.

It is not a weakly prime, because it can be changed into another prime (816390863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408195416 + 408195417.

It is an arithmetic number, because the mean of its divisors is an integer number (408195417).

Almost surely, 2^816390833 is an apocalyptic number.

It is an amenable number.

816390833 is a deficient number, since it is larger than the sum of its proper divisors (1).

816390833 is an equidigital number, since it uses as much as digits as its factorization.

816390833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 816390833 is about 28572.5538410552. The cubic root of 816390833 is about 934.6149130556.

The spelling of 816390833 in words is "eight hundred sixteen million, three hundred ninety thousand, eight hundred thirty-three".