31331124 has 120 divisors (see below), whose sum is σ = 91476000. Its totient is φ = 9270720.

The previous prime is 31331117. The next prime is 31331137. The reversal of 31331124 is 42113313.

It is a super-2 number, since 2×31331124² = 1963278662206752, which contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 31331097 and 31331106.

It is a congruent number.

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 39 ways as a sum of consecutive naturals, for example, 210202 + ... + 210350.

It is an arithmetic number, because the mean of its divisors is an integer number (762300).

Almost surely, 2^31331124 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 31331124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45738000).

31331124 is an abundant number, since it is smaller than the sum of its proper divisors (60144876).

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

31331124 is a wasteful number, since it uses less digits than its factorization.

31331124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235 (or 224 counting only the distinct ones).

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

The square root of 31331124 is about 5597.4211919419. The cubic root of 31331124 is about 315.2525865220.

Adding to 31331124 its reverse (42113313), we get a palindrome (73444437).

The spelling of 31331124 in words is "thirty-one million, three hundred thirty-one thousand, one hundred twenty-four".