31971343 has 4 divisors (see below), whose sum is σ = 32001688. Its totient is φ = 31941000.

The previous prime is 31971341. The next prime is 31971383. The reversal of 31971343 is 34317913.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31971343 - 2¹ = 31971341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31971341) 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, 13533 + ... + 15718.

It is an arithmetic number, because the mean of its divisors is an integer number (8000422).

Almost surely, 2^31971343 is an apocalyptic number.

31971343 is a deficient number, since it is larger than the sum of its proper divisors (30345).

31971343 is a wasteful number, since it uses less digits than its factorization.

31971343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30344.

The product of its digits is 6804, while the sum is 31.

The square root of 31971343 is about 5654.3207372769. The cubic root of 31971343 is about 317.3854109395.

The spelling of 31971343 in words is "thirty-one million, nine hundred seventy-one thousand, three hundred forty-three".