1808135143 has 2 divisors, whose sum is σ = 1808135144. Its totient is φ = 1808135142.

The previous prime is 1808135117. The next prime is 1808135149. The reversal of 1808135143 is 3415318081.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1808135143 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1808135099 and 1808135108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1808135149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904067571 + 904067572.

It is an arithmetic number, because the mean of its divisors is an integer number (904067572).

Almost surely, 2^1808135143 is an apocalyptic number.

1808135143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1808135143 is an equidigital number, since it uses as much as digits as its factorization.

1808135143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 1808135143 is about 42522.1723692476. The cubic root of 1808135143 is about 1218.2702223815.

The spelling of 1808135143 in words is "one billion, eight hundred eight million, one hundred thirty-five thousand, one hundred forty-three".