31140343 has 4 divisors (see below), whose sum is σ = 33535768. Its totient is φ = 28744920.

The previous prime is 31140331. The next prime is 31140349. The reversal of 31140343 is 34304113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34304113 = 17 ⋅2017889.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31140343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31140343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31140349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1197693 + ... + 1197718.

It is an arithmetic number, because the mean of its divisors is an integer number (8383942).

Almost surely, 2^31140343 is an apocalyptic number.

31140343 is a deficient number, since it is larger than the sum of its proper divisors (2395425).

31140343 is a wasteful number, since it uses less digits than its factorization.

31140343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2395424.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 31140343 is about 5580.3533042273. The cubic root of 31140343 is about 314.6114062614.

Adding to 31140343 its reverse (34304113), we get a palindrome (65444456).

The spelling of 31140343 in words is "thirty-one million, one hundred forty thousand, three hundred forty-three".