18103031 has 4 divisors (see below), whose sum is σ = 18399864. Its totient is φ = 17806200.

The previous prime is 18103003. The next prime is 18103049. The reversal of 18103031 is 13030181.

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 18103031 - 2¹⁴ = 18086647 is a prime.

It is a super-2 number, since 2×18103031² = 655439462773922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18103061) 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, 148325 + ... + 148446.

It is an arithmetic number, because the mean of its divisors is an integer number (4599966).

Almost surely, 2^18103031 is an apocalyptic number.

18103031 is a deficient number, since it is larger than the sum of its proper divisors (296833).

18103031 is an equidigital number, since it uses as much as digits as its factorization.

18103031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296832.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 18103031 is about 4254.7656809747. The cubic root of 18103031 is about 262.5732209951.

The spelling of 18103031 in words is "eighteen million, one hundred three thousand, thirty-one".