18130815239 has 4 divisors (see below), whose sum is σ = 18134301120. Its totient is φ = 18127329360.

The previous prime is 18130815191. The next prime is 18130815251. The reversal of 18130815239 is 93251803181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93251803181 = 2029 ⋅45959489.

It is a cyclic number.

It is not a de Polignac number, because 18130815239 - 2³² = 13835847943 is a prime.

It is a super-2 number, since 2×18130815239² (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 = 18130815196 and 18130815205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18130805239) 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, 1735127 + ... + 1745544.

It is an arithmetic number, because the mean of its divisors is an integer number (4533575280).

Almost surely, 2^18130815239 is an apocalyptic number.

18130815239 is a deficient number, since it is larger than the sum of its proper divisors (3485881).

18130815239 is an equidigital number, since it uses as much as digits as its factorization.

18130815239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3485880.

The product of its (nonzero) digits is 51840, while the sum is 41.

The spelling of 18130815239 in words is "eighteen billion, one hundred thirty million, eight hundred fifteen thousand, two hundred thirty-nine".