31540012 has 24 divisors (see below), whose sum is σ = 63334656. Its totient is φ = 13462608.

The previous prime is 31540009. The next prime is 31540013. The reversal of 31540012 is 21004513.

It is not an unprimeable number, because it can be changed into a prime (31540013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5223 + ... + 9505.

It is an arithmetic number, because the mean of its divisors is an integer number (2638944).

Almost surely, 2^31540012 is an apocalyptic number.

It is an amenable number.

31540012 is an abundant number, since it is smaller than the sum of its proper divisors (31794644).

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

31540012 is a wasteful number, since it uses less digits than its factorization.

31540012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4557 (or 4555 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 31540012 is about 5616.0495012063. The cubic root of 31540012 is about 315.9516429769.

Adding to 31540012 its reverse (21004513), we get a palindrome (52544525).

The spelling of 31540012 in words is "thirty-one million, five hundred forty thousand, twelve".