31520143140 has 48 divisors (see below), whose sum is σ = 88288921728. Its totient is φ = 8402274304.

The previous prime is 31520143111. The next prime is 31520143147. The reversal of 31520143140 is 4134102513.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31520143140.

It is not an unprimeable number, because it can be changed into a prime (31520143147) 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, 69769 + ... + 260591.

It is an arithmetic number, because the mean of its divisors is an integer number (1839352536).

Almost surely, 2^31520143140 is an apocalyptic number.

31520143140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31520143140 is an abundant number, since it is smaller than the sum of its proper divisors (56768778588).

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

31520143140 is a wasteful number, since it uses less digits than its factorization.

31520143140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193588 (or 193586 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 31520143140 its reverse (4134102513), we get a palindrome (35654245653).

The spelling of 31520143140 in words is "thirty-one billion, five hundred twenty million, one hundred forty-three thousand, one hundred forty".