18471143 has 2 divisors, whose sum is σ = 18471144. Its totient is φ = 18471142.

The previous prime is 18471137. The next prime is 18471161. The reversal of 18471143 is 34117481.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18471143 - 2¹² = 18467047 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18471113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9235571 + 9235572.

It is an arithmetic number, because the mean of its divisors is an integer number (9235572).

Almost surely, 2^18471143 is an apocalyptic number.

18471143 is a deficient number, since it is larger than the sum of its proper divisors (1).

18471143 is an equidigital number, since it uses as much as digits as its factorization.

18471143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 29.

The square root of 18471143 is about 4297.8067662472. The cubic root of 18471143 is about 264.3410374844.

The spelling of 18471143 in words is "eighteen million, four hundred seventy-one thousand, one hundred forty-three".