31121144 has 32 divisors (see below), whose sum is σ = 61231680. Its totient is φ = 14811264.

The previous prime is 31121137. The next prime is 31121171. The reversal of 31121144 is 44112113.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12794 + ... + 15030.

It is an arithmetic number, because the mean of its divisors is an integer number (1913490).

Almost surely, 2^31121144 is an apocalyptic number.

It is an amenable number.

31121144 is a deficient number, since it is larger than the sum of its proper divisors (30110536).

31121144 is a wasteful number, since it uses less digits than its factorization.

31121144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327 (or 2323 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 31121144 is about 5578.6328074180. The cubic root of 31121144 is about 314.5467370300.

Adding to 31121144 its reverse (44112113), we get a palindrome (75233257).

The spelling of 31121144 in words is "thirty-one million, one hundred twenty-one thousand, one hundred forty-four".