1816131143 has 2 divisors, whose sum is σ = 1816131144. Its totient is φ = 1816131142.

The previous prime is 1816131139. The next prime is 1816131181. The reversal of 1816131143 is 3411316181.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1816131143 - 2² = 1816131139 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1816131103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908065571 + 908065572.

It is an arithmetic number, because the mean of its divisors is an integer number (908065572).

Almost surely, 2^1816131143 is an apocalyptic number.

1816131143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816131143 is an equidigital number, since it uses as much as digits as its factorization.

1816131143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 1816131143 is about 42616.0901890354. The cubic root of 1816131143 is about 1220.0634077498.

The spelling of 1816131143 in words is "one billion, eight hundred sixteen million, one hundred thirty-one thousand, one hundred forty-three".