31040812 has 24 divisors (see below), whose sum is σ = 59431680. Its totient is φ = 14068560.

The previous prime is 31040809. The next prime is 31040819. The reversal of 31040812 is 21804013.

It is a self number, because there is not a number n which added to its sum of digits gives 31040812.

It is not an unprimeable number, because it can be changed into a prime (31040819) 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, 18513 + ... + 20119.

It is an arithmetic number, because the mean of its divisors is an integer number (2476320).

Almost surely, 2^31040812 is an apocalyptic number.

It is an amenable number.

31040812 is a deficient number, since it is larger than the sum of its proper divisors (28390868).

31040812 is a wasteful number, since it uses less digits than its factorization.

31040812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061 (or 2059 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 31040812 is about 5571.4281831502. The cubic root of 31040812 is about 314.2758607300.

Adding to 31040812 its reverse (21804013), we get a palindrome (52844825).

The spelling of 31040812 in words is "thirty-one million, forty thousand, eight hundred twelve".