18871103 has 2 divisors, whose sum is σ = 18871104. Its totient is φ = 18871102.

The previous prime is 18871093. The next prime is 18871121. The reversal of 18871103 is 30117881.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18871103 - 2⁴ = 18871087 is a prime.

It is a super-2 number, since 2×18871103² = 712237056873218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18871133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9435551 + 9435552.

It is an arithmetic number, because the mean of its divisors is an integer number (9435552).

Almost surely, 2^18871103 is an apocalyptic number.

18871103 is a deficient number, since it is larger than the sum of its proper divisors (1).

18871103 is an equidigital number, since it uses as much as digits as its factorization.

18871103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 18871103 is about 4344.0882817917. The cubic root of 18871103 is about 266.2353759224.

Adding to 18871103 its reverse (30117881), we get a palindrome (48988984).

The spelling of 18871103 in words is "eighteen million, eight hundred seventy-one thousand, one hundred three".