31681012 has 12 divisors (see below), whose sum is σ = 60482016. Its totient is φ = 14400440.

The previous prime is 31681007. The next prime is 31681043. The reversal of 31681012 is 21018613.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

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, 359968 + ... + 360055.

It is an arithmetic number, because the mean of its divisors is an integer number (5040168).

Almost surely, 2^31681012 is an apocalyptic number.

It is an amenable number.

31681012 is a deficient number, since it is larger than the sum of its proper divisors (28801004).

31681012 is a wasteful number, since it uses less digits than its factorization.

31681012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720038 (or 720036 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 31681012 is about 5628.5888107056. The cubic root of 31681012 is about 316.4217649727.

Adding to 31681012 its reverse (21018613), we get a palindrome (52699625).

The spelling of 31681012 in words is "thirty-one million, six hundred eighty-one thousand, twelve".