31109472 has 72 divisors (see below), whose sum is σ = 89369280. Its totient is φ = 10264320.

The previous prime is 31109467. The next prime is 31109483. The reversal of 31109472 is 27490113.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30897 + ... + 31887.

It is an arithmetic number, because the mean of its divisors is an integer number (1241240).

Almost surely, 2^31109472 is an apocalyptic number.

31109472 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31109472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44684640).

31109472 is an abundant number, since it is smaller than the sum of its proper divisors (58259808).

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

31109472 is a wasteful number, since it uses less digits than its factorization.

31109472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 31109472 is about 5577.5865748548. The cubic root of 31109472 is about 314.5074084779.

Adding to 31109472 its reverse (27490113), we get a palindrome (58599585).

The spelling of 31109472 in words is "thirty-one million, one hundred nine thousand, four hundred seventy-two".