31301211312 has 120 divisors (see below), whose sum is σ = 100159556640. Its totient is φ = 8939151360.

The previous prime is 31301211307. The next prime is 31301211343. The reversal of 31301211312 is 21311210313.

31301211312 is a `hidden beast` number, since 31 + 301 + 21 + 1 + 312 = 666.

It is a super-2 number, since 2×31301211312² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2757264 + ... + 2768592.

It is an arithmetic number, because the mean of its divisors is an integer number (834662972).

Almost surely, 2^31301211312 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 31301211312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50079778320).

31301211312 is an abundant number, since it is smaller than the sum of its proper divisors (68858345328).

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

31301211312 is a wasteful number, since it uses less digits than its factorization.

31301211312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14091 (or 14082 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 31301211312 its reverse (21311210313), we get a palindrome (52612421625).

Subtracting from 31301211312 its reverse (21311210313), we obtain a palindrome (9990000999).

The spelling of 31301211312 in words is "thirty-one billion, three hundred one million, two hundred eleven thousand, three hundred twelve".