31325135631 has 48 divisors (see below), whose sum is σ = 44856138240. Its totient is φ = 19390855680.

The previous prime is 31325135627. The next prime is 31325135651. The reversal of 31325135631 is 13653152313.

It is a happy number.

It is not a de Polignac number, because 31325135631 - 2² = 31325135627 is a prime.

It is a super-3 number, since 3×31325135631³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 31325135592 and 31325135601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31325135651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 85354410 + ... + 85354776.

It is an arithmetic number, because the mean of its divisors is an integer number (934502880).

Almost surely, 2^31325135631 is an apocalyptic number.

31325135631 is a deficient number, since it is larger than the sum of its proper divisors (13531002609).

31325135631 is a wasteful number, since it uses less digits than its factorization.

31325135631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 816 (or 743 counting only the distinct ones).

The product of its digits is 24300, while the sum is 33.

Adding to 31325135631 its reverse (13653152313), we get a palindrome (44978287944).

The spelling of 31325135631 in words is "thirty-one billion, three hundred twenty-five million, one hundred thirty-five thousand, six hundred thirty-one".