31663943 has 4 divisors (see below), whose sum is σ = 32200680. Its totient is φ = 31127208.

The previous prime is 31663921. The next prime is 31663963. The reversal of 31663943 is 34936613.

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 31663943 - 2¹⁰ = 31662919 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 (31663913) 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, 268280 + ... + 268397.

It is an arithmetic number, because the mean of its divisors is an integer number (8050170).

Almost surely, 2^31663943 is an apocalyptic number.

31663943 is a deficient number, since it is larger than the sum of its proper divisors (536737).

31663943 is an equidigital number, since it uses as much as digits as its factorization.

31663943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536736.

The product of its digits is 34992, while the sum is 35.

The square root of 31663943 is about 5627.0723293734. The cubic root of 31663943 is about 316.3649278429.

The spelling of 31663943 in words is "thirty-one million, six hundred sixty-three thousand, nine hundred forty-three".