31666916 has 6 divisors (see below), whose sum is σ = 55417110. Its totient is φ = 15833456.

The previous prime is 31666909. The next prime is 31666919. The reversal of 31666916 is 61966613.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 31360000 + 306916 = 5600^2 + 554^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31666916.

It is not an unprimeable number, because it can be changed into a prime (31666919) 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 as a sum of consecutive naturals, namely, 3958361 + ... + 3958368.

It is an arithmetic number, because the mean of its divisors is an integer number (9236185).

Almost surely, 2^31666916 is an apocalyptic number.

It is an amenable number.

31666916 is a deficient number, since it is larger than the sum of its proper divisors (23750194).

31666916 is a wasteful number, since it uses less digits than its factorization.

31666916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7916733 (or 7916731 counting only the distinct ones).

The product of its digits is 34992, while the sum is 38.

The square root of 31666916 is about 5627.3364925158. The cubic root of 31666916 is about 316.3748289418.

The spelling of 31666916 in words is "thirty-one million, six hundred sixty-six thousand, nine hundred sixteen".