31143616 has 42 divisors (see below), whose sum is σ = 71897748. Its totient is φ = 13345920.

The previous prime is 31143613. The next prime is 31143667. The reversal of 31143616 is 61634113.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (31143613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1830 + ... + 8101.

Almost surely, 2^31143616 is an apocalyptic number.

It is an amenable number.

31143616 is an abundant number, since it is smaller than the sum of its proper divisors (40754132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31143616 is an equidigital number, since it uses as much as digits as its factorization.

31143616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9957 (or 9940 counting only the distinct ones).

The product of its digits is 1296, while the sum is 25.

The square root of 31143616 is about 5580.6465575236. The cubic root of 31143616 is about 314.6224282665.

Adding to 31143616 its reverse (61634113), we get a palindrome (92777729).

The spelling of 31143616 in words is "thirty-one million, one hundred forty-three thousand, six hundred sixteen".