816298591 has 2 divisors, whose sum is σ = 816298592. Its totient is φ = 816298590.

The previous prime is 816298559. The next prime is 816298607. The reversal of 816298591 is 195892618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816298591 - 2⁵ = 816298559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816298291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408149295 + 408149296.

It is an arithmetic number, because the mean of its divisors is an integer number (408149296).

Almost surely, 2^816298591 is an apocalyptic number.

816298591 is a deficient number, since it is larger than the sum of its proper divisors (1).

816298591 is an equidigital number, since it uses as much as digits as its factorization.

816298591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 49.

The square root of 816298591 is about 28570.9396240306. The cubic root of 816298591 is about 934.5797117801.

The spelling of 816298591 in words is "eight hundred sixteen million, two hundred ninety-eight thousand, five hundred ninety-one".