31321241172 has 108 divisors (see below), whose sum is σ = 86113329120. Its totient is φ = 9594426816.

The previous prime is 31321241117. The next prime is 31321241177. The reversal of 31321241172 is 27114212313.

31321241172 is a `hidden beast` number, since 31 + 3 + 212 + 411 + 7 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321241177) 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 35 ways as a sum of consecutive naturals, for example, 1369729 + ... + 1392407.

It is an arithmetic number, because the mean of its divisors is an integer number (797345640).

Almost surely, 2^31321241172 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 31321241172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43056664560).

31321241172 is an abundant number, since it is smaller than the sum of its proper divisors (54792087948).

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

31321241172 is a wasteful number, since it uses less digits than its factorization.

31321241172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22942 (or 22924 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

Adding to 31321241172 its reverse (27114212313), we get a palindrome (58435453485).

The spelling of 31321241172 in words is "thirty-one billion, three hundred twenty-one million, two hundred forty-one thousand, one hundred seventy-two".