1099985819 has 2 divisors, whose sum is σ = 1099985820. Its totient is φ = 1099985818.

The previous prime is 1099985773. The next prime is 1099985857. The reversal of 1099985819 is 9185899901.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1099985819 - 2¹² = 1099981723 is a prime.

It is a super-2 number, since 2×1099985819² = 2419937604002201522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1099985869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 549992909 + 549992910.

It is an arithmetic number, because the mean of its divisors is an integer number (549992910).

Almost surely, 2^1099985819 is an apocalyptic number.

1099985819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1099985819 is an equidigital number, since it uses as much as digits as its factorization.

1099985819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 59.

The square root of 1099985819 is about 33166.0341162461. The cubic root of 1099985819 is about 1032.2756794481.

The spelling of 1099985819 in words is "one billion, ninety-nine million, nine hundred eighty-five thousand, eight hundred nineteen".