31116540 has 192 divisors, whose sum is σ = 110638080. Its totient is φ = 6359040.

The previous prime is 31116523. The next prime is 31116559. The reversal of 31116540 is 4561113.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 223791 + ... + 223929.

It is an arithmetic number, because the mean of its divisors is an integer number (576240).

Almost surely, 2^31116540 is an apocalyptic number.

31116540 is a gapful number since it is divisible by the number (30) 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 31116540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55319040).

31116540 is an abundant number, since it is smaller than the sum of its proper divisors (79521540).

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

31116540 is a wasteful number, since it uses less digits than its factorization.

31116540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 210 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 31116540 is about 5578.2201462474. The cubic root of 31116540 is about 314.5312251260.

Adding to 31116540 its reverse (4561113), we get a palindrome (35677653).

The spelling of 31116540 in words is "thirty-one million, one hundred sixteen thousand, five hundred forty".