18990234143 has 2 divisors, whose sum is σ = 18990234144. Its totient is φ = 18990234142.

The previous prime is 18990234101. The next prime is 18990234157. The reversal of 18990234143 is 34143209981.

It is a strong prime.

It is an emirp because it is prime and its reverse (34143209981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18990234143 - 2⁸ = 18990233887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18990234094 and 18990234103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18990234443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9495117071 + 9495117072.

It is an arithmetic number, because the mean of its divisors is an integer number (9495117072).

Almost surely, 2^18990234143 is an apocalyptic number.

18990234143 is a deficient number, since it is larger than the sum of its proper divisors (1).

18990234143 is an equidigital number, since it uses as much as digits as its factorization.

18990234143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 18990234143 in words is "eighteen billion, nine hundred ninety million, two hundred thirty-four thousand, one hundred forty-three".