31309966 has 16 divisors (see below), whose sum is σ = 48924000. Its totient is φ = 15009568.

The previous prime is 31309963. The next prime is 31309973. The reversal of 31309966 is 66990313.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31309961) 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 7 ways as a sum of consecutive naturals, for example, 6831 + ... + 10453.

It is an arithmetic number, because the mean of its divisors is an integer number (3057750).

Almost surely, 2^31309966 is an apocalyptic number.

31309966 is a deficient number, since it is larger than the sum of its proper divisors (17614034).

31309966 is a wasteful number, since it uses less digits than its factorization.

31309966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3803.

The product of its (nonzero) digits is 26244, while the sum is 37.

The square root of 31309966 is about 5595.5308952771. The cubic root of 31309966 is about 315.1816068763.

The spelling of 31309966 in words is "thirty-one million, three hundred nine thousand, nine hundred sixty-six".