31331002340 has 48 divisors (see below), whose sum is σ = 72076919040. Its totient is φ = 11345402880.

The previous prime is 31331002303. The next prime is 31331002343. The reversal of 31331002340 is 4320013313.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (31331002343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245357 + ... + 350516.

It is an arithmetic number, because the mean of its divisors is an integer number (1501602480).

Almost surely, 2^31331002340 is an apocalyptic number.

It is an amenable number.

31331002340 is an abundant number, since it is smaller than the sum of its proper divisors (40745916700).

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

31331002340 is a wasteful number, since it uses less digits than its factorization.

31331002340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596132 (or 596130 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31331002340 its reverse (4320013313), we get a palindrome (35651015653).

The spelling of 31331002340 in words is "thirty-one billion, three hundred thirty-one million, two thousand, three hundred forty".