201131310111 has 4 divisors (see below), whose sum is σ = 268175080152. Its totient is φ = 134087540072.

The previous prime is 201131310109. The next prime is 201131310199. The reversal of 201131310111 is 111013131102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201131310111 - 2¹ = 201131310109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201131315111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33521885016 + ... + 33521885021.

It is an arithmetic number, because the mean of its divisors is an integer number (67043770038).

Almost surely, 2^201131310111 is an apocalyptic number.

201131310111 is a deficient number, since it is larger than the sum of its proper divisors (67043770041).

201131310111 is an equidigital number, since it uses as much as digits as its factorization.

201131310111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67043770040.

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 201131310111 its reverse (111013131102), we get a palindrome (312144441213).

The spelling of 201131310111 in words is "two hundred one billion, one hundred thirty-one million, three hundred ten thousand, one hundred eleven".