1309872143 has 4 divisors (see below), whose sum is σ = 1309965048. Its totient is φ = 1309779240.

The previous prime is 1309872121. The next prime is 1309872163. The reversal of 1309872143 is 3412789031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3412789031 = 2273 ⋅1501447.

It is a cyclic number.

It is not a de Polignac number, because 1309872143 - 2²⁰ = 1308823567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1309872097 and 1309872106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309872163) 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, 20453 + ... + 55118.

It is an arithmetic number, because the mean of its divisors is an integer number (327491262).

Almost surely, 2^1309872143 is an apocalyptic number.

1309872143 is a deficient number, since it is larger than the sum of its proper divisors (92905).

1309872143 is an equidigital number, since it uses as much as digits as its factorization.

1309872143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92904.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1309872143 is about 36192.1558213931. The cubic root of 1309872143 is about 1094.1485824682.

The spelling of 1309872143 in words is "one billion, three hundred nine million, eight hundred seventy-two thousand, one hundred forty-three".