31603104 has 144 divisors (see below), whose sum is σ = 101267712. Its totient is φ = 9275904.

The previous prime is 31603079. The next prime is 31603109. The reversal of 31603104 is 40130613.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31603109) 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 23 ways as a sum of consecutive naturals, for example, 85929 + ... + 86295.

It is an arithmetic number, because the mean of its divisors is an integer number (703248).

Almost surely, 2^31603104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31603104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50633856).

31603104 is an abundant number, since it is smaller than the sum of its proper divisors (69664608).

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

31603104 is a wasteful number, since it uses less digits than its factorization.

31603104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 408 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 31603104 is about 5621.6638106525. The cubic root of 31603104 is about 316.1621770750.

Adding to 31603104 its reverse (40130613), we get a palindrome (71733717).

The spelling of 31603104 in words is "thirty-one million, six hundred three thousand, one hundred four".