31687343 has 4 divisors (see below), whose sum is σ = 32780040. Its totient is φ = 30594648.

The previous prime is 31687339. The next prime is 31687379. The reversal of 31687343 is 34378613.

It is a happy number.

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 31687343 - 2² = 31687339 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 (31687333) 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, 546305 + ... + 546362.

It is an arithmetic number, because the mean of its divisors is an integer number (8195010).

Almost surely, 2^31687343 is an apocalyptic number.

31687343 is a deficient number, since it is larger than the sum of its proper divisors (1092697).

31687343 is a wasteful number, since it uses less digits than its factorization.

31687343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092696.

The product of its digits is 36288, while the sum is 35.

The square root of 31687343 is about 5629.1511793520. The cubic root of 31687343 is about 316.4428410331.

The spelling of 31687343 in words is "thirty-one million, six hundred eighty-seven thousand, three hundred forty-three".