18311011 has 2 divisors, whose sum is σ = 18311012. Its totient is φ = 18311010.

The previous prime is 18310973. The next prime is 18311039. The reversal of 18311011 is 11011381.

It is a strong prime.

It is an emirp because it is prime and its reverse (11011381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18311011 - 2⁹ = 18310499 is a prime.

It is not a weakly prime, because it can be changed into another prime (18311081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9155505 + 9155506.

It is an arithmetic number, because the mean of its divisors is an integer number (9155506).

Almost surely, 2^18311011 is an apocalyptic number.

18311011 is a deficient number, since it is larger than the sum of its proper divisors (1).

18311011 is an equidigital number, since it uses as much as digits as its factorization.

18311011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

The square root of 18311011 is about 4279.1367120016. The cubic root of 18311011 is about 263.5749348501.

Adding to 18311011 its reverse (11011381), we get a palindrome (29322392).

The spelling of 18311011 in words is "eighteen million, three hundred eleven thousand, eleven".