143891399 has 2 divisors, whose sum is σ = 143891400. Its totient is φ = 143891398.

The previous prime is 143891387. The next prime is 143891401. The reversal of 143891399 is 993198341.

It is a strong prime.

It is an emirp because it is prime and its reverse (993198341) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143891399 is a prime.

Together with 143891401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143896399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71945699 + 71945700.

It is an arithmetic number, because the mean of its divisors is an integer number (71945700).

Almost surely, 2^143891399 is an apocalyptic number.

143891399 is a deficient number, since it is larger than the sum of its proper divisors (1).

143891399 is an equidigital number, since it uses as much as digits as its factorization.

143891399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 47.

The square root of 143891399 is about 11995.4741048447. The cubic root of 143891399 is about 524.0164794363.

The spelling of 143891399 in words is "one hundred forty-three million, eight hundred ninety-one thousand, three hundred ninety-nine".