1816554497 has 2 divisors, whose sum is σ = 1816554498. Its totient is φ = 1816554496.

The previous prime is 1816554491. The next prime is 1816554511. The reversal of 1816554497 is 7944556181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 941814721 + 874739776 = 30689^2 + 29576^2 .

It is a cyclic number.

It is not a de Polignac number, because 1816554497 - 2¹⁸ = 1816292353 is a prime.

It is not a weakly prime, because it can be changed into another prime (1816554491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908277248 + 908277249.

It is an arithmetic number, because the mean of its divisors is an integer number (908277249).

Almost surely, 2^1816554497 is an apocalyptic number.

It is an amenable number.

1816554497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816554497 is an equidigital number, since it uses as much as digits as its factorization.

1816554497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 50.

The square root of 1816554497 is about 42621.0569671847. The cubic root of 1816554497 is about 1220.1582024083.

The spelling of 1816554497 in words is "one billion, eight hundred sixteen million, five hundred fifty-four thousand, four hundred ninety-seven".