201131122231 has 16 divisors (see below), whose sum is σ = 225232882560. Its totient is φ = 178328586240.

The previous prime is 201131122229. The next prime is 201131122261. The reversal of 201131122231 is 132221131102.

It is a cyclic number.

It is not a de Polignac number, because 201131122231 - 2¹ = 201131122229 is a prime.

It is a super-2 number, since 2×201131122231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201131122199 and 201131122208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201131122201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1309375 + ... + 1454896.

It is an arithmetic number, because the mean of its divisors is an integer number (14077055160).

Almost surely, 2^201131122231 is an apocalyptic number.

201131122231 is a deficient number, since it is larger than the sum of its proper divisors (24101760329).

201131122231 is a wasteful number, since it uses less digits than its factorization.

201131122231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764506.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 201131122231 its reverse (132221131102), we get a palindrome (333352253333).

The spelling of 201131122231 in words is "two hundred one billion, one hundred thirty-one million, one hundred twenty-two thousand, two hundred thirty-one".