31120104 has 32 divisors (see below), whose sum is σ = 81184320. Its totient is φ = 9922176.

The previous prime is 31120091. The next prime is 31120109. The reversal of 31120104 is 40102113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a self number, because there is not a number n which added to its sum of digits gives 31120104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27637 + ... + 28740.

It is an arithmetic number, because the mean of its divisors is an integer number (2537010).

Almost surely, 2^31120104 is an apocalyptic number.

It is an amenable number.

31120104 is an abundant number, since it is smaller than the sum of its proper divisors (50064216).

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

31120104 is a wasteful number, since it uses less digits than its factorization.

31120104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56409 (or 56405 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 31120104 is about 5578.5395938364. The cubic root of 31120104 is about 314.5432331715.

Adding to 31120104 its reverse (40102113), we get a palindrome (71222217).

Subtracting 31120104 from its reverse (40102113), we obtain a square (8982009 = 2997²).

The spelling of 31120104 in words is "thirty-one million, one hundred twenty thousand, one hundred four".