18009031 has 2 divisors, whose sum is σ = 18009032. Its totient is φ = 18009030.

The previous prime is 18008993. The next prime is 18009049. The reversal of 18009031 is 13090081.

It is a strong prime.

It is an emirp because it is prime and its reverse (13090081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18009031 - 2⁹ = 18008519 is a prime.

It is a super-2 number, since 2×18009031² = 648650395117922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18008993 and 18009011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18009631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9004515 + 9004516.

It is an arithmetic number, because the mean of its divisors is an integer number (9004516).

Almost surely, 2^18009031 is an apocalyptic number.

18009031 is a deficient number, since it is larger than the sum of its proper divisors (1).

18009031 is an equidigital number, since it uses as much as digits as its factorization.

18009031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 18009031 is about 4243.7048672121. The cubic root of 18009031 is about 262.1179615661.

The spelling of 18009031 in words is "eighteen million, nine thousand, thirty-one".