18181063 has 4 divisors (see below), whose sum is σ = 18971568. Its totient is φ = 17390560.

The previous prime is 18181039. The next prime is 18181103. The reversal of 18181063 is 36018181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36018181 = 151 ⋅238531.

It is a cyclic number.

It is not a de Polignac number, because 18181063 - 2¹³ = 18172871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18181013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395218 + ... + 395263.

It is an arithmetic number, because the mean of its divisors is an integer number (4742892).

Almost surely, 2^18181063 is an apocalyptic number.

18181063 is a deficient number, since it is larger than the sum of its proper divisors (790505).

18181063 is an equidigital number, since it uses as much as digits as its factorization.

18181063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790504.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 18181063 is about 4263.9257732751. The cubic root of 18181063 is about 262.9499487901.

The spelling of 18181063 in words is "eighteen million, one hundred eighty-one thousand, sixty-three".