18111437 has 2 divisors, whose sum is σ = 18111438. Its totient is φ = 18111436.

The previous prime is 18111361. The next prime is 18111473. The reversal of 18111437 is 73411181.

Together with next prime (18111473) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12187081 + 5924356 = 3491^2 + 2434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18111437 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18111487) 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, 9055718 + 9055719.

It is an arithmetic number, because the mean of its divisors is an integer number (9055719).

Almost surely, 2^18111437 is an apocalyptic number.

It is an amenable number.

18111437 is a deficient number, since it is larger than the sum of its proper divisors (1).

18111437 is an equidigital number, since it uses as much as digits as its factorization.

18111437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 26.

The square root of 18111437 is about 4255.7533998107. The cubic root of 18111437 is about 262.6138559759.

The spelling of 18111437 in words is "eighteen million, one hundred eleven thousand, four hundred thirty-seven".