999899143 has 2 divisors, whose sum is σ = 999899144. Its totient is φ = 999899142.

The previous prime is 999899101. The next prime is 999899189. The reversal of 999899143 is 341998999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999899143 - 2²⁵ = 966344711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999899443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499949571 + 499949572.

It is an arithmetic number, because the mean of its divisors is an integer number (499949572).

Almost surely, 2^999899143 is an apocalyptic number.

999899143 is a deficient number, since it is larger than the sum of its proper divisors (1).

999899143 is an equidigital number, since it uses as much as digits as its factorization.

999899143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5668704, while the sum is 61.

The square root of 999899143 is about 31621.1818722830. The cubic root of 999899143 is about 999.9663798697.

The spelling of 999899143 in words is "nine hundred ninety-nine million, eight hundred ninety-nine thousand, one hundred forty-three".