31120144 has 20 divisors (see below), whose sum is σ = 65777040. Its totient is φ = 14145440.

The previous prime is 31120121. The next prime is 31120153. The reversal of 31120144 is 44102113.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 88234 + ... + 88585.

It is an arithmetic number, because the mean of its divisors is an integer number (3288852).

Almost surely, 2^31120144 is an apocalyptic number.

It is an amenable number.

31120144 is an abundant number, since it is smaller than the sum of its proper divisors (34656896).

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

31120144 is a wasteful number, since it uses less digits than its factorization.

31120144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176838 (or 176832 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 31120144 is about 5578.5431790029. The cubic root of 31120144 is about 314.5433679368.

Adding to 31120144 its reverse (44102113), we get a palindrome (75222257).

The spelling of 31120144 in words is "thirty-one million, one hundred twenty thousand, one hundred forty-four".