143991321 has 8 divisors (see below), whose sum is σ = 192835104. Its totient is φ = 95570880.

The previous prime is 143991319. The next prime is 143991347. The reversal of 143991321 is 123199341.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 143991321 - 2¹ = 143991319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (143991361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105040 + ... + 106401.

It is an arithmetic number, because the mean of its divisors is an integer number (24104388).

Almost surely, 2^143991321 is an apocalyptic number.

It is an amenable number.

143991321 is a deficient number, since it is larger than the sum of its proper divisors (48843783).

143991321 is a wasteful number, since it uses less digits than its factorization.

143991321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211671.

The product of its digits is 5832, while the sum is 33.

The square root of 143991321 is about 11999.6383695510. The cubic root of 143991321 is about 524.1377483457.

The spelling of 143991321 in words is "one hundred forty-three million, nine hundred ninety-one thousand, three hundred twenty-one".