201131111113231 has 4 divisors (see below), whose sum is σ = 216602735045032. Its totient is φ = 185659487181432.

The previous prime is 201131111113217. The next prime is 201131111113237. The reversal of 201131111113231 is 132311111131102.

It is a happy number.

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 201131111113231 - 2³³ = 201122521178639 is a prime.

It is a super-2 number, since 2×201131111113231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201131111113237) 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, 7735811965881 + ... + 7735811965906.

It is an arithmetic number, because the mean of its divisors is an integer number (54150683761258).

Almost surely, 2^{201131111113231} is an apocalyptic number.

201131111113231 is a deficient number, since it is larger than the sum of its proper divisors (15471623931801).

201131111113231 is a wasteful number, since it uses less digits than its factorization.

201131111113231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15471623931800.

The product of its (nonzero) digits is 108, while the sum is 22.

Adding to 201131111113231 its reverse (132311111131102), we get a palindrome (333442222244333).

The spelling of 201131111113231 in words is "two hundred one trillion, one hundred thirty-one billion, one hundred eleven million, one hundred thirteen thousand, two hundred thirty-one".