143664191 has 4 divisors (see below), whose sum is σ = 156724584. Its totient is φ = 130603800.

The previous prime is 143664167. The next prime is 143664253. The reversal of 143664191 is 191466341.

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-143664191 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 (143664791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6530180 + ... + 6530201.

It is an arithmetic number, because the mean of its divisors is an integer number (39181146).

Almost surely, 2^143664191 is an apocalyptic number.

143664191 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

143664191 is a deficient number, since it is larger than the sum of its proper divisors (13060393).

143664191 is a wasteful number, since it uses less digits than its factorization.

143664191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13060392.

The product of its digits is 15552, while the sum is 35.

The square root of 143664191 is about 11985.9997914233. Note that the first 3 decimals coincide. The cubic root of 143664191 is about 523.7405225718.

The spelling of 143664191 in words is "one hundred forty-three million, six hundred sixty-four thousand, one hundred ninety-one".