31643012 has 12 divisors (see below), whose sum is σ = 56663376. Its totient is φ = 15453480.

The previous prime is 31642987. The next prime is 31643041. The reversal of 31643012 is 21034613.

It is a super-3 number, since 3×31643012³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91814 + ... + 92157.

It is an arithmetic number, because the mean of its divisors is an integer number (4721948).

Almost surely, 2^31643012 is an apocalyptic number.

It is an amenable number.

31643012 is a deficient number, since it is larger than the sum of its proper divisors (25020364).

31643012 is a wasteful number, since it uses less digits than its factorization.

31643012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184018 (or 184016 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 31643012 is about 5625.2121737762. The cubic root of 31643012 is about 316.2952029623.

Adding to 31643012 its reverse (21034613), we get a palindrome (52677625).

The spelling of 31643012 in words is "thirty-one million, six hundred forty-three thousand, twelve".