31325140520 has 32 divisors (see below), whose sum is σ = 72120676320. Its totient is φ = 12238658880.

The previous prime is 31325140507. The next prime is 31325140531. The reversal of 31325140520 is 2504152313.

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 31325140520.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9104426 + ... + 9107865.

It is an arithmetic number, because the mean of its divisors is an integer number (2253771135).

Almost surely, 2^31325140520 is an apocalyptic number.

It is an amenable number.

31325140520 is an abundant number, since it is smaller than the sum of its proper divisors (40795535800).

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

31325140520 is a wasteful number, since it uses less digits than its factorization.

31325140520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18212345 (or 18212341 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 31325140520 its reverse (2504152313), we get a palindrome (33829292833).

The spelling of 31325140520 in words is "thirty-one billion, three hundred twenty-five million, one hundred forty thousand, five hundred twenty".