818719009 has 2 divisors, whose sum is σ = 818719010. Its totient is φ = 818719008.

The previous prime is 818718977. The next prime is 818719019. The reversal of 818719009 is 900917818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630261025 + 188457984 = 25105^2 + 13728^2 .

It is a cyclic number.

It is not a de Polignac number, because 818719009 - 2⁵ = 818718977 is a prime.

It is not a weakly prime, because it can be changed into another prime (818719019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 409359504 + 409359505.

It is an arithmetic number, because the mean of its divisors is an integer number (409359505).

Almost surely, 2^818719009 is an apocalyptic number.

It is an amenable number.

818719009 is a deficient number, since it is larger than the sum of its proper divisors (1).

818719009 is an equidigital number, since it uses as much as digits as its factorization.

818719009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 43.

The square root of 818719009 is about 28613.2663112760. The cubic root of 818719009 is about 935.5025119618.

The spelling of 818719009 in words is "eight hundred eighteen million, seven hundred nineteen thousand, nine".