18113737 has 2 divisors, whose sum is σ = 18113738. Its totient is φ = 18113736.

The previous prime is 18113699. The next prime is 18113743. The reversal of 18113737 is 73731181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17065161 + 1048576 = 4131^2 + 1024^2 .

It is an emirp because it is prime and its reverse (73731181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18113737 - 2¹⁹ = 17589449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18113699 and 18113708.

It is not a weakly prime, because it can be changed into another prime (18113237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9056868 + 9056869.

It is an arithmetic number, because the mean of its divisors is an integer number (9056869).

Almost surely, 2^18113737 is an apocalyptic number.

It is an amenable number.

18113737 is a deficient number, since it is larger than the sum of its proper divisors (1).

18113737 is an equidigital number, since it uses as much as digits as its factorization.

18113737 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3528, while the sum is 31.

The square root of 18113737 is about 4256.0236136563. The cubic root of 18113737 is about 262.6249720882.

The spelling of 18113737 in words is "eighteen million, one hundred thirteen thousand, seven hundred thirty-seven".