18493008121 has 9 divisors (see below), whose sum is σ = 21513382149. Its totient is φ = 15850333884.

The previous prime is 18493008103. The next prime is 18493008133. The reversal of 18493008121 is 12180039481.

The square root of 18493008121 is 135989.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 18493008121 - 2⁵ = 18493008089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18493009121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 942210 + ... + 961636.

Almost surely, 2^18493008121 is an apocalyptic number.

18493008121 is the 135989-th square number.

18493008121 is the 67995-th centered octagonal number.

It is an amenable number.

18493008121 is a deficient number, since it is larger than the sum of its proper divisors (3020374028).

18493008121 is an frugal number, since it uses more digits than its factorization.

18493008121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38868 (or 19434 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 37.

The spelling of 18493008121 in words is "eighteen billion, four hundred ninety-three million, eight thousand, one hundred twenty-one".