31111306512 has 160 divisors (see below), whose sum is σ = 94619943936. Its totient is φ = 8684198400.

The previous prime is 31111306489. The next prime is 31111306519. The reversal of 31111306512 is 21560311113.

It is a super-2 number, since 2×31111306512² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (31111306519) 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 31 ways as a sum of consecutive naturals, for example, 3448087 + ... + 3457097.

Almost surely, 2^31111306512 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 31111306512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47309971968).

31111306512 is an abundant number, since it is smaller than the sum of its proper divisors (63508637424).

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

31111306512 is a wasteful number, since it uses less digits than its factorization.

31111306512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9549 (or 9543 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 24.

Adding to 31111306512 its reverse (21560311113), we get a palindrome (52671617625).

The spelling of 31111306512 in words is "thirty-one billion, one hundred eleven million, three hundred six thousand, five hundred twelve".