18103039731 has 16 divisors (see below), whose sum is σ = 30650649600. Its totient is φ = 10344594024.

The previous prime is 18103039687. The next prime is 18103039789. The reversal of 18103039731 is 13793030181.

It is not a de Polignac number, because 18103039731 - 2⁶ = 18103039667 is a prime.

It is a super-2 number, since 2×18103039731² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18103039631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47891451 + ... + 47891828.

It is an arithmetic number, because the mean of its divisors is an integer number (1915665600).

Almost surely, 2^18103039731 is an apocalyptic number.

18103039731 is a deficient number, since it is larger than the sum of its proper divisors (12547609869).

18103039731 is an equidigital number, since it uses as much as digits as its factorization.

18103039731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95783295 (or 95783289 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The spelling of 18103039731 in words is "eighteen billion, one hundred three million, thirty-nine thousand, seven hundred thirty-one".