143789681 has 4 divisors (see below), whose sum is σ = 164331072. Its totient is φ = 123248292.

The previous prime is 143789671. The next prime is 143789693. The reversal of 143789681 is 186987341.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186987341 = 19 ⋅9841439.

It is a cyclic number.

It is not a de Polignac number, because 143789681 - 2¹⁴ = 143773297 is a prime.

It is a super-4 number, since 4×143789681⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (143789671) 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, 10270685 + ... + 10270698.

It is an arithmetic number, because the mean of its divisors is an integer number (41082768).

Almost surely, 2^143789681 is an apocalyptic number.

It is an amenable number.

143789681 is a deficient number, since it is larger than the sum of its proper divisors (20541391).

143789681 is an equidigital number, since it uses as much as digits as its factorization.

143789681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20541390.

The product of its digits is 290304, while the sum is 47.

The square root of 143789681 is about 11991.2335061911. The cubic root of 143789681 is about 523.8929731591.

The spelling of 143789681 in words is "one hundred forty-three million, seven hundred eighty-nine thousand, six hundred eighty-one".