18036038231 has 4 divisors (see below), whose sum is σ = 18038125512. Its totient is φ = 18033950952.

The previous prime is 18036038221. The next prime is 18036038233. The reversal of 18036038231 is 13283063081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13283063081 = 79 ⋅168140039.

It is a cyclic number.

It is not a de Polignac number, because 18036038231 - 2²² = 18031843927 is a prime.

It is a super-2 number, since 2×18036038231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18036038191 and 18036038200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18036038233) 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, 1030625 + ... + 1047978.

It is an arithmetic number, because the mean of its divisors is an integer number (4509531378).

Almost surely, 2^18036038231 is an apocalyptic number.

18036038231 is a deficient number, since it is larger than the sum of its proper divisors (2087281).

18036038231 is an equidigital number, since it uses as much as digits as its factorization.

18036038231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2087280.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 18036038231 in words is "eighteen billion, thirty-six million, thirty-eight thousand, two hundred thirty-one".