143991889 has 2 divisors, whose sum is σ = 143991890. Its totient is φ = 143991888.

The previous prime is 143991863. The next prime is 143991917. The reversal of 143991889 is 988199341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86490000 + 57501889 = 9300^2 + 7583^2 .

It is a cyclic number.

It is not a de Polignac number, because 143991889 - 2⁵ = 143991857 is a prime.

It is not a weakly prime, because it can be changed into another prime (143991829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71995944 + 71995945.

It is an arithmetic number, because the mean of its divisors is an integer number (71995945).

Almost surely, 2^143991889 is an apocalyptic number.

It is an amenable number.

143991889 is a deficient number, since it is larger than the sum of its proper divisors (1).

143991889 is an equidigital number, since it uses as much as digits as its factorization.

143991889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 52.

The square root of 143991889 is about 11999.6620369075. The cubic root of 143991889 is about 524.1384375304.

The spelling of 143991889 in words is "one hundred forty-three million, nine hundred ninety-one thousand, eight hundred eighty-nine".