31312032136 has 96 divisors (see below), whose sum is σ = 75228454080. Its totient is φ = 12080880000.

The previous prime is 31312032107. The next prime is 31312032137. The reversal of 31312032136 is 63123021313.

31312032136 is a modest number, since divided by 32136 gives 31312 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 31312032136.

It is not an unprimeable number, because it can be changed into a prime (31312032137) 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, 408886 + ... + 479386.

It is an arithmetic number, because the mean of its divisors is an integer number (783629730).

Almost surely, 2^31312032136 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 31312032136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37614227040).

31312032136 is an abundant number, since it is smaller than the sum of its proper divisors (43916421944).

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

31312032136 is a wasteful number, since it uses less digits than its factorization.

31312032136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70635 (or 70624 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 31312032136 its reverse (63123021313), we get a palindrome (94435053449).

The spelling of 31312032136 in words is "thirty-one billion, three hundred twelve million, thirty-two thousand, one hundred thirty-six".