18917011 has 2 divisors, whose sum is σ = 18917012. Its totient is φ = 18917010.

The previous prime is 18917009. The next prime is 18917029. The reversal of 18917011 is 11071981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18917011 - 2¹ = 18917009 is a prime.

Together with 18917009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18917071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9458505 + 9458506.

It is an arithmetic number, because the mean of its divisors is an integer number (9458506).

Almost surely, 2^18917011 is an apocalyptic number.

18917011 is a deficient number, since it is larger than the sum of its proper divisors (1).

18917011 is an equidigital number, since it uses as much as digits as its factorization.

18917011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 28.

The square root of 18917011 is about 4349.3690346992. The cubic root of 18917011 is about 266.4510926166.

Adding to 18917011 its reverse (11071981), we get a palindrome (29988992).

The spelling of 18917011 in words is "eighteen million, nine hundred seventeen thousand, eleven".