31331143340 has 96 divisors (see below), whose sum is σ = 76166504064. Its totient is φ = 10603929600.

The previous prime is 31331143313. The next prime is 31331143343. The reversal of 31331143340 is 4334113313.

It is a super-3 number, since 3×31331143340³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (31331143343) 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, 4988282 + ... + 4994558.

It is an arithmetic number, because the mean of its divisors is an integer number (793401084).

Almost surely, 2^31331143340 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 31331143340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38083252032).

31331143340 is an abundant number, since it is smaller than the sum of its proper divisors (44835360724).

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

31331143340 is a wasteful number, since it uses less digits than its factorization.

31331143340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6747 (or 6745 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 31331143340 its reverse (4334113313), we get a palindrome (35665256653).

The spelling of 31331143340 in words is "thirty-one billion, three hundred thirty-one million, one hundred forty-three thousand, three hundred forty".