143643811987 has 4 divisors (see below), whose sum is σ = 154693336000. Its totient is φ = 132594287976.

The previous prime is 143643811903. The next prime is 143643812003. The reversal of 143643811987 is 789118346341.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143643811987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143643811187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5524761987 + ... + 5524762012.

It is an arithmetic number, because the mean of its divisors is an integer number (38673334000).

Almost surely, 2^143643811987 is an apocalyptic number.

143643811987 is a deficient number, since it is larger than the sum of its proper divisors (11049524013).

143643811987 is a wasteful number, since it uses less digits than its factorization.

143643811987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11049524012.

The product of its digits is 3483648, while the sum is 55.

The spelling of 143643811987 in words is "one hundred forty-three billion, six hundred forty-three million, eight hundred eleven thousand, nine hundred eighty-seven".