31211344356 has 48 divisors (see below), whose sum is σ = 76109652864. Its totient is φ = 9936146176.

The previous prime is 31211344277. The next prime is 31211344357. The reversal of 31211344356 is 65344311213.

It is not an unprimeable number, because it can be changed into a prime (31211344357) 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 15 ways as a sum of consecutive naturals, for example, 93640 + ... + 266816.

It is an arithmetic number, because the mean of its divisors is an integer number (1585617768).

Almost surely, 2^31211344356 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 31211344356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38054826432).

31211344356 is an abundant number, since it is smaller than the sum of its proper divisors (44898308508).

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

31211344356 is a wasteful number, since it uses less digits than its factorization.

31211344356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173860 (or 173858 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

Adding to 31211344356 its reverse (65344311213), we get a palindrome (96555655569).

The spelling of 31211344356 in words is "thirty-one billion, two hundred eleven million, three hundred forty-four thousand, three hundred fifty-six".