818942791 has 2 divisors, whose sum is σ = 818942792. Its totient is φ = 818942790.

The previous prime is 818942777. The next prime is 818942827. The reversal of 818942791 is 197249818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 818942791 - 2⁹ = 818942279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (818942291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409471395 + 409471396.

It is an arithmetic number, because the mean of its divisors is an integer number (409471396).

Almost surely, 2^818942791 is an apocalyptic number.

818942791 is a deficient number, since it is larger than the sum of its proper divisors (1).

818942791 is an equidigital number, since it uses as much as digits as its factorization.

818942791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 49.

The square root of 818942791 is about 28617.1765029326. The cubic root of 818942791 is about 935.5877384151.

The spelling of 818942791 in words is "eight hundred eighteen million, nine hundred forty-two thousand, seven hundred ninety-one".