18188801 has 2 divisors, whose sum is σ = 18188802. Its totient is φ = 18188800.

The previous prime is 18188777. The next prime is 18188803. The reversal of 18188801 is 10888181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16613776 + 1575025 = 4076^2 + 1255^2 .

It is an emirp because it is prime and its reverse (10888181) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18188801 is a prime.

Together with 18188803, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18188803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9094400 + 9094401.

It is an arithmetic number, because the mean of its divisors is an integer number (9094401).

Almost surely, 2^18188801 is an apocalyptic number.

It is an amenable number.

18188801 is a deficient number, since it is larger than the sum of its proper divisors (1).

18188801 is an equidigital number, since it uses as much as digits as its factorization.

18188801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4096, while the sum is 35.

The square root of 18188801 is about 4264.8330565217. The cubic root of 18188801 is about 262.9872480046.

The spelling of 18188801 in words is "eighteen million, one hundred eighty-eight thousand, eight hundred one".