1285831343 has 4 divisors (see below), whose sum is σ = 1285939200. Its totient is φ = 1285723488.

The previous prime is 1285831301. The next prime is 1285831367. The reversal of 1285831343 is 3431385821.

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: 3431385821 = 29 ⋅118323649.

It is a cyclic number.

It is not a de Polignac number, because 1285831343 - 2¹⁰ = 1285830319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1285831297 and 1285831306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1285831373) 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, 33455 + ... + 60752.

It is an arithmetic number, because the mean of its divisors is an integer number (321484800).

Almost surely, 2^1285831343 is an apocalyptic number.

1285831343 is a deficient number, since it is larger than the sum of its proper divisors (107857).

1285831343 is an equidigital number, since it uses as much as digits as its factorization.

1285831343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107856.

The product of its digits is 69120, while the sum is 38.

The square root of 1285831343 is about 35858.4905287437. The cubic root of 1285831343 is about 1087.4133720224.

The spelling of 1285831343 in words is "one billion, two hundred eighty-five million, eight hundred thirty-one thousand, three hundred forty-three".