18000181831 has 2 divisors, whose sum is σ = 18000181832. Its totient is φ = 18000181830.

The previous prime is 18000181817. The next prime is 18000181861. The reversal of 18000181831 is 13818100081.

It is a weak prime.

It is an emirp because it is prime and its reverse (13818100081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18000181831 - 2²¹ = 17998084679 is a prime.

It is a super-2 number, since 2×18000181831² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18000181793 and 18000181802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18000181861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000090915 + 9000090916.

It is an arithmetic number, because the mean of its divisors is an integer number (9000090916).

Almost surely, 2^18000181831 is an apocalyptic number.

18000181831 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000181831 is an equidigital number, since it uses as much as digits as its factorization.

18000181831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 31.

The spelling of 18000181831 in words is "eighteen billion, one hundred eighty-one thousand, eight hundred thirty-one".