143991871 has 4 divisors (see below), whose sum is σ = 144044152. Its totient is φ = 143939592.

The previous prime is 143991863. The next prime is 143991889. The reversal of 143991871 is 178199341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178199341 = 7477 ⋅23833.

It is a cyclic number.

It is not a de Polignac number, because 143991871 - 2³ = 143991863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143991811) 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 in 3 ways as a sum of consecutive naturals, for example, 21765 + ... + 27598.

It is an arithmetic number, because the mean of its divisors is an integer number (36011038).

Almost surely, 2^143991871 is an apocalyptic number.

143991871 is a deficient number, since it is larger than the sum of its proper divisors (52281).

143991871 is an equidigital number, since it uses as much as digits as its factorization.

143991871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52280.

The product of its digits is 54432, while the sum is 43.

The square root of 143991871 is about 11999.6612868864. The cubic root of 143991871 is about 524.1384156901.

The spelling of 143991871 in words is "one hundred forty-three million, nine hundred ninety-one thousand, eight hundred seventy-one".