31131126 has 24 divisors (see below), whose sum is σ = 72639840. Its totient is φ = 9578736.

The previous prime is 31131119. The next prime is 31131127. The reversal of 31131126 is 62113113.

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 = 31131099 and 31131108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131127) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66286 + ... + 66753.

It is an arithmetic number, because the mean of its divisors is an integer number (3026660).

Almost surely, 2^31131126 is an apocalyptic number.

31131126 is an abundant number, since it is smaller than the sum of its proper divisors (41508714).

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

31131126 is a wasteful number, since it uses less digits than its factorization.

31131126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133060 (or 133057 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 31131126 is about 5579.5273993413. The cubic root of 31131126 is about 314.5803633634.

Adding to 31131126 its reverse (62113113), we get a palindrome (93244239).

The spelling of 31131126 in words is "thirty-one million, one hundred thirty-one thousand, one hundred twenty-six".