18007111 has 2 divisors, whose sum is σ = 18007112. Its totient is φ = 18007110.

The previous prime is 18007061. The next prime is 18007133. The reversal of 18007111 is 11170081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18007111 - 2¹³ = 17998919 is a prime.

It is a super-3 number, since 3×18007111³ (a number of 23 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18007151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9003555 + 9003556.

It is an arithmetic number, because the mean of its divisors is an integer number (9003556).

Almost surely, 2^18007111 is an apocalyptic number.

18007111 is a deficient number, since it is larger than the sum of its proper divisors (1).

18007111 is an equidigital number, since it uses as much as digits as its factorization.

18007111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 19.

The square root of 18007111 is about 4243.4786437544. The cubic root of 18007111 is about 262.1086461588.

Adding to 18007111 its reverse (11170081), we get a palindrome (29177192).

It can be divided in two parts, 1800 and 7111, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 18007111 in words is "eighteen million, seven thousand, one hundred eleven".