31643023 has 4 divisors (see below), whose sum is σ = 31664880. Its totient is φ = 31621168.

The previous prime is 31642987. The next prime is 31643041. The reversal of 31643023 is 32034613.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31643023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31642985 and 31643003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31643123) 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, 8590 + ... + 11707.

It is an arithmetic number, because the mean of its divisors is an integer number (7916220).

Almost surely, 2^31643023 is an apocalyptic number.

31643023 is a deficient number, since it is larger than the sum of its proper divisors (21857).

31643023 is a wasteful number, since it uses less digits than its factorization.

31643023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21856.

The product of its (nonzero) digits is 1296, while the sum is 22.

The square root of 31643023 is about 5625.2131515170. The cubic root of 31643023 is about 316.2952396133.

Adding to 31643023 its reverse (32034613), we get a palindrome (63677636).

The spelling of 31643023 in words is "thirty-one million, six hundred forty-three thousand, twenty-three".