18190093 has 2 divisors, whose sum is σ = 18190094. Its totient is φ = 18190092.

The previous prime is 18190063. The next prime is 18190103. The reversal of 18190093 is 39009181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9351364 + 8838729 = 3058^2 + 2973^2 .

It is an emirp because it is prime and its reverse (39009181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18190093 - 2⁹ = 18189581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18190063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9095046 + 9095047.

It is an arithmetic number, because the mean of its divisors is an integer number (9095047).

Almost surely, 2^18190093 is an apocalyptic number.

It is an amenable number.

18190093 is a deficient number, since it is larger than the sum of its proper divisors (1).

18190093 is an equidigital number, since it uses as much as digits as its factorization.

18190093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 18190093 is about 4264.9845251771. The cubic root of 18190093 is about 262.9934747570.

The spelling of 18190093 in words is "eighteen million, one hundred ninety thousand, ninety-three".