143849989 has 2 divisors, whose sum is σ = 143849990. Its totient is φ = 143849988.

The previous prime is 143849987. The next prime is 143850059. The reversal of 143849989 is 989948341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143640225 + 209764 = 11985^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 143849989 - 2¹ = 143849987 is a prime.

Together with 143849987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143849983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71924994 + 71924995.

It is an arithmetic number, because the mean of its divisors is an integer number (71924995).

Almost surely, 2^143849989 is an apocalyptic number.

It is an amenable number.

143849989 is a deficient number, since it is larger than the sum of its proper divisors (1).

143849989 is an equidigital number, since it uses as much as digits as its factorization.

143849989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2239488, while the sum is 55.

The square root of 143849989 is about 11993.7479129753. The cubic root of 143849989 is about 523.9662063264.

The spelling of 143849989 in words is "one hundred forty-three million, eight hundred forty-nine thousand, nine hundred eighty-nine".