18701113 has 2 divisors, whose sum is σ = 18701114. Its totient is φ = 18701112.

The previous prime is 18701083. The next prime is 18701183. The reversal of 18701113 is 31110781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14341369 + 4359744 = 3787^2 + 2088^2 .

It is a cyclic number.

It is not a de Polignac number, because 18701113 - 2⁹ = 18700601 is a prime.

It is not a weakly prime, because it can be changed into another prime (18701183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9350556 + 9350557.

It is an arithmetic number, because the mean of its divisors is an integer number (9350557).

Almost surely, 2^18701113 is an apocalyptic number.

It is an amenable number.

18701113 is a deficient number, since it is larger than the sum of its proper divisors (1).

18701113 is an equidigital number, since it uses as much as digits as its factorization.

18701113 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 22.

The square root of 18701113 is about 4324.4783500441. The cubic root of 18701113 is about 265.4335516067.

Adding to 18701113 its reverse (31110781), we get a palindrome (49811894).

The spelling of 18701113 in words is "eighteen million, seven hundred one thousand, one hundred thirteen".