201511331112 has 128 divisors (see below), whose sum is σ = 620828006400. Its totient is φ = 53077863168.

The previous prime is 201511331041. The next prime is 201511331123. The reversal of 201511331112 is 211133115102.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1660189 + ... + 1777427.

It is an arithmetic number, because the mean of its divisors is an integer number (4850218800).

Almost surely, 2^201511331112 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 201511331112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (310414003200).

201511331112 is an abundant number, since it is smaller than the sum of its proper divisors (419316675288).

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

201511331112 is a wasteful number, since it uses less digits than its factorization.

201511331112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118055 (or 118051 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

Adding to 201511331112 its reverse (211133115102), we get a palindrome (412644446214).

The spelling of 201511331112 in words is "two hundred one billion, five hundred eleven million, three hundred thirty-one thousand, one hundred twelve".