1085990819 has 2 divisors, whose sum is σ = 1085990820. Its totient is φ = 1085990818.

The previous prime is 1085990803. The next prime is 1085990827. The reversal of 1085990819 is 9180995801.

It is a strong prime.

It is an emirp because it is prime and its reverse (9180995801) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1085990819 - 2⁴ = 1085990803 is a prime.

It is a super-2 number, since 2×1085990819² = 2358752117904581522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1085990849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 542995409 + 542995410.

It is an arithmetic number, because the mean of its divisors is an integer number (542995410).

Almost surely, 2^1085990819 is an apocalyptic number.

1085990819 is a deficient number, since it is larger than the sum of its proper divisors (1).

1085990819 is an equidigital number, since it uses as much as digits as its factorization.

1085990819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 50.

The square root of 1085990819 is about 32954.3748082102. The cubic root of 1085990819 is about 1027.8791370646.

The spelling of 1085990819 in words is "one billion, eighty-five million, nine hundred ninety thousand, eight hundred nineteen".