18003031 has 4 divisors (see below), whose sum is σ = 18018000. Its totient is φ = 17988064.

The previous prime is 18003023. The next prime is 18003067. The reversal of 18003031 is 13030081.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18003031 - 2³ = 18003023 is a prime.

It is a super-2 number, since 2×18003031² = 648218250373922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18002996 and 18003014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18003001) 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, 5506 + ... + 8143.

It is an arithmetic number, because the mean of its divisors is an integer number (4504500).

Almost surely, 2^18003031 is an apocalyptic number.

18003031 is a deficient number, since it is larger than the sum of its proper divisors (14969).

18003031 is a wasteful number, since it uses less digits than its factorization.

18003031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14968.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 18003031 is about 4242.9978788588. The cubic root of 18003031 is about 262.0888487197.

The spelling of 18003031 in words is "eighteen million, three thousand, thirty-one".