201111312 has 20 divisors (see below), whose sum is σ = 519537680. Its totient is φ = 67037088.

The previous prime is 201111299. The next prime is 201111329. The reversal of 201111312 is 213111102.

It is a super-2 number, since 2×201111312² = 80891519628722688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2094862 + ... + 2094957.

It is an arithmetic number, because the mean of its divisors is an integer number (25976884).

Almost surely, 2^201111312 is an apocalyptic number.

It is an amenable number.

201111312 is an abundant number, since it is smaller than the sum of its proper divisors (318426368).

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

201111312 is a wasteful number, since it uses less digits than its factorization.

201111312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4189830 (or 4189824 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 201111312 is about 14181.3720069674. The cubic root of 201111312 is about 585.8847129221.

Adding to 201111312 its reverse (213111102), we get a palindrome (414222414).

The spelling of 201111312 in words is "two hundred one million, one hundred eleven thousand, three hundred twelve".