309143 has 4 divisors (see below), whose sum is σ = 322608. Its totient is φ = 295680.

The previous prime is 309137. The next prime is 309157. The reversal of 309143 is 341903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341903 = 53 ⋅6451.

It is a cyclic number.

It is not a de Polignac number, because 309143 - 2⁶ = 309079 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309143.

It is not an unprimeable number, because it can be changed into a prime (309173) 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, 6698 + ... + 6743.

It is an arithmetic number, because the mean of its divisors is an integer number (80652).

2³⁰⁹¹⁴³ is an apocalyptic number.

309143 is a deficient number, since it is larger than the sum of its proper divisors (13465).

309143 is a wasteful number, since it uses less digits than its factorization.

309143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13464.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 309143 is about 556.0062949284. The cubic root of 309143 is about 67.6165704042.

The spelling of 309143 in words is "three hundred nine thousand, one hundred forty-three".