18199801 has 2 divisors, whose sum is σ = 18199802. Its totient is φ = 18199800.

The previous prime is 18199771. The next prime is 18199823. The reversal of 18199801 is 10899181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18020025 + 179776 = 4245^2 + 424^2 .

It is an emirp because it is prime and its reverse (10899181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18199801 - 2¹³ = 18191609 is a prime.

It is not a weakly prime, because it can be changed into another prime (18199861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9099900 + 9099901.

It is an arithmetic number, because the mean of its divisors is an integer number (9099901).

Almost surely, 2^18199801 is an apocalyptic number.

It is an amenable number.

18199801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18199801 is an equidigital number, since it uses as much as digits as its factorization.

18199801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 18199801 is about 4266.1224783168. The cubic root of 18199801 is about 263.0402527218.

The spelling of 18199801 in words is "eighteen million, one hundred ninety-nine thousand, eight hundred one".