18121108 has 6 divisors (see below), whose sum is σ = 31711946. Its totient is φ = 9060552.

The previous prime is 18121093. The next prime is 18121123. The reversal of 18121108 is 80112181.

It is an interprime number because it is at equal distance from previous prime (18121093) and next prime (18121123).

It can be written as a sum of positive squares in only one way, i.e., 11710084 + 6411024 = 3422^2 + 2532^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2265135 + ... + 2265142.

Almost surely, 2^18121108 is an apocalyptic number.

It is an amenable number.

18121108 is a deficient number, since it is larger than the sum of its proper divisors (13590838).

18121108 is a wasteful number, since it uses less digits than its factorization.

18121108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4530281 (or 4530279 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 22.

The square root of 18121108 is about 4256.8894747221. The cubic root of 18121108 is about 262.6605904727.

Adding to 18121108 its reverse (80112181), we get a palindrome (98233289).

The spelling of 18121108 in words is "eighteen million, one hundred twenty-one thousand, one hundred eight".