31511343132 has 72 divisors (see below), whose sum is σ = 81222130080. Its totient is φ = 10297272960.

The previous prime is 31511343121. The next prime is 31511343137. The reversal of 31511343132 is 23134311513.

31511343132 is a `hidden beast` number, since 315 + 1 + 1 + 34 + 313 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31511343096 and 31511343105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31511343137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2628969 + ... + 2640927.

It is an arithmetic number, because the mean of its divisors is an integer number (1128085140).

Almost surely, 2^31511343132 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 31511343132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40611065040).

31511343132 is an abundant number, since it is smaller than the sum of its proper divisors (49710786948).

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

31511343132 is a wasteful number, since it uses less digits than its factorization.

31511343132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13403 (or 13398 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

Adding to 31511343132 its reverse (23134311513), we get a palindrome (54645654645).

The spelling of 31511343132 in words is "thirty-one billion, five hundred eleven million, three hundred forty-three thousand, one hundred thirty-two".