31000812 has 24 divisors (see below), whose sum is σ = 73083696. Its totient is φ = 10226688.

The previous prime is 31000811. The next prime is 31000829. The reversal of 31000812 is 21800013.

It is a happy number.

It is a super-2 number, since 2×31000812² = 1922100689318688, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31000791 and 31000800.

It is not an unprimeable number, because it can be changed into a prime (31000811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12153 + ... + 14480.

It is an arithmetic number, because the mean of its divisors is an integer number (3045154).

Almost surely, 2^31000812 is an apocalyptic number.

It is an amenable number.

31000812 is an abundant number, since it is smaller than the sum of its proper divisors (42082884).

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

31000812 is a wasteful number, since it uses less digits than its factorization.

31000812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26737 (or 26735 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 31000812 is about 5567.8372821051. The cubic root of 31000812 is about 314.1408080121.

Adding to 31000812 its reverse (21800013), we get a palindrome (52800825).

The spelling of 31000812 in words is "thirty-one million, eight hundred twelve", and thus it is an aban number.