143921289 has 4 divisors (see below), whose sum is σ = 191895056. Its totient is φ = 95947524.

The previous prime is 143921273. The next prime is 143921291. The reversal of 143921289 is 982129341.

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.

It is not a de Polignac number, because 143921289 - 2⁴ = 143921273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143921209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23986879 + ... + 23986884.

It is an arithmetic number, because the mean of its divisors is an integer number (47973764).

Almost surely, 2^143921289 is an apocalyptic number.

It is an amenable number.

143921289 is a deficient number, since it is larger than the sum of its proper divisors (47973767).

143921289 is an equidigital number, since it uses as much as digits as its factorization.

143921289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47973766.

The product of its digits is 31104, while the sum is 39.

The square root of 143921289 is about 11996.7199267133. The cubic root of 143921289 is about 524.0527608918.

The spelling of 143921289 in words is "one hundred forty-three million, nine hundred twenty-one thousand, two hundred eighty-nine".