18089981001 has 27 divisors (see below), whose sum is σ = 26439561421. Its totient is φ = 11918763384.

The previous prime is 18089980981. The next prime is 18089981017. The reversal of 18089981001 is 10018998081.

The square root of 18089981001 is 134499.

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

It is not a de Polignac number, because 18089981001 - 2²⁹ = 17553110089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18089981051) 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 26 ways as a sum of consecutive naturals, for example, 43173970 + ... + 43174388.

Almost surely, 2^18089981001 is an apocalyptic number.

18089981001 is the 134499-th square number.

18089981001 is the 67250-th centered octagonal number.

It is an amenable number.

18089981001 is a deficient number, since it is larger than the sum of its proper divisors (8349580420).

18089981001 is an frugal number, since it uses more digits than its factorization.

18089981001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058 (or 529 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 45.

The spelling of 18089981001 in words is "eighteen billion, eighty-nine million, nine hundred eighty-one thousand, one".