18739112891 has 2 divisors, whose sum is σ = 18739112892. Its totient is φ = 18739112890.

The previous prime is 18739112867. The next prime is 18739112893. The reversal of 18739112891 is 19821193781.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18739112891 - 2¹⁸ = 18738850747 is a prime.

Together with 18739112893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18739112893) 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 as a sum of consecutive naturals, namely, 9369556445 + 9369556446.

It is an arithmetic number, because the mean of its divisors is an integer number (9369556446).

Almost surely, 2^18739112891 is an apocalyptic number.

18739112891 is a deficient number, since it is larger than the sum of its proper divisors (1).

18739112891 is an equidigital number, since it uses as much as digits as its factorization.

18739112891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 50.

The spelling of 18739112891 in words is "eighteen billion, seven hundred thirty-nine million, one hundred twelve thousand, eight hundred ninety-one".