1808318497 has 2 divisors, whose sum is σ = 1808318498. Its totient is φ = 1808318496.

The previous prime is 1808318459. The next prime is 1808318503. The reversal of 1808318497 is 7948138081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1613548561 + 194769936 = 40169^2 + 13956^2 .

It is a cyclic number.

It is not a de Polignac number, because 1808318497 - 2¹¹ = 1808316449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1808318497.

It is not a weakly prime, because it can be changed into another prime (1808318417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904159248 + 904159249.

It is an arithmetic number, because the mean of its divisors is an integer number (904159249).

Almost surely, 2^1808318497 is an apocalyptic number.

It is an amenable number.

1808318497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1808318497 is an equidigital number, since it uses as much as digits as its factorization.

1808318497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 49.

The square root of 1808318497 is about 42524.3282956945. The cubic root of 1808318497 is about 1218.3114005661.

The spelling of 1808318497 in words is "one billion, eight hundred eight million, three hundred eighteen thousand, four hundred ninety-seven".