1801890199 has 2 divisors, whose sum is σ = 1801890200. Its totient is φ = 1801890198.

The previous prime is 1801890179. The next prime is 1801890229. The reversal of 1801890199 is 9910981081.

It is a weak prime.

It is an emirp because it is prime and its reverse (9910981081) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1801890199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1801890109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900945099 + 900945100.

It is an arithmetic number, because the mean of its divisors is an integer number (900945100).

Almost surely, 2^1801890199 is an apocalyptic number.

1801890199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801890199 is an equidigital number, since it uses as much as digits as its factorization.

1801890199 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 46.

The square root of 1801890199 is about 42448.6772349858. The cubic root of 1801890199 is about 1216.8660491240.

The spelling of 1801890199 in words is "one billion, eight hundred one million, eight hundred ninety thousand, one hundred ninety-nine".