18334531891 has 16 divisors (see below), whose sum is σ = 19888662528. Its totient is φ = 16801092000.

The previous prime is 18334531889. The next prime is 18334531913. The reversal of 18334531891 is 19813543381.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18334531891 - 2¹ = 18334531889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18334531091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5744106 + ... + 5747296.

It is an arithmetic number, because the mean of its divisors is an integer number (1243041408).

Almost surely, 2^18334531891 is an apocalyptic number.

18334531891 is a deficient number, since it is larger than the sum of its proper divisors (1554130637).

18334531891 is a wasteful number, since it uses less digits than its factorization.

18334531891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6282.

The product of its digits is 311040, while the sum is 46.

The spelling of 18334531891 in words is "eighteen billion, three hundred thirty-four million, five hundred thirty-one thousand, eight hundred ninety-one".