816334397 has 2 divisors, whose sum is σ = 816334398. Its totient is φ = 816334396.

The previous prime is 816334381. The next prime is 816334429. The reversal of 816334397 is 793433618.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 797158756 + 19175641 = 28234^2 + 4379^2 .

It is a cyclic number.

It is not a de Polignac number, because 816334397 - 2⁴ = 816334381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816334327) 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, 408167198 + 408167199.

It is an arithmetic number, because the mean of its divisors is an integer number (408167199).

Almost surely, 2^816334397 is an apocalyptic number.

It is an amenable number.

816334397 is a deficient number, since it is larger than the sum of its proper divisors (1).

816334397 is an equidigital number, since it uses as much as digits as its factorization.

816334397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 44.

The square root of 816334397 is about 28571.5662328826. The cubic root of 816334397 is about 934.5933763355.

The spelling of 816334397 in words is "eight hundred sixteen million, three hundred thirty-four thousand, three hundred ninety-seven".