31143660 has 96 divisors (see below), whose sum is σ = 97251840. Its totient is φ = 7400448.

The previous prime is 31143613. The next prime is 31143667. The reversal of 31143660 is 6634113.

It is a self number, because there is not a number n which added to its sum of digits gives 31143660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18577 + ... + 20183.

It is an arithmetic number, because the mean of its divisors is an integer number (1013040).

Almost surely, 2^31143660 is an apocalyptic number.

31143660 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 31143660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48625920).

31143660 is an abundant number, since it is smaller than the sum of its proper divisors (66108180).

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

31143660 is a wasteful number, since it uses less digits than its factorization.

31143660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655 (or 1653 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 31143660 is about 5580.6504997178. The cubic root of 31143660 is about 314.6225764336.

Adding to 31143660 its reverse (6634113), we get a palindrome (37777773).

The spelling of 31143660 in words is "thirty-one million, one hundred forty-three thousand, six hundred sixty".