31121612 has 6 divisors (see below), whose sum is σ = 54462828. Its totient is φ = 15560804.

The previous prime is 31121603. The next prime is 31121617. The reversal of 31121612 is 21612113.

It is not an unprimeable number, because it can be changed into a prime (31121617) 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 as a sum of consecutive naturals, namely, 3890198 + ... + 3890205.

It is an arithmetic number, because the mean of its divisors is an integer number (9077138).

Almost surely, 2^31121612 is an apocalyptic number.

It is an amenable number.

31121612 is a deficient number, since it is larger than the sum of its proper divisors (23341216).

31121612 is a wasteful number, since it uses less digits than its factorization.

31121612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7780407 (or 7780405 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 31121612 is about 5578.6747530215. The cubic root of 31121612 is about 314.5483137408.

Adding to 31121612 its reverse (21612113), we get a palindrome (52733725).

The spelling of 31121612 in words is "thirty-one million, one hundred twenty-one thousand, six hundred twelve".