201811131 has 24 divisors (see below), whose sum is σ = 322077600. Its totient is φ = 121118976.

The previous prime is 201811081. The next prime is 201811139. The reversal of 201811131 is 131118102.

It is a happy number.

201811131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 201811131 - 2⁶ = 201811067 is a prime.

It is a super-2 number, since 2×201811131² = 81455465190998322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (201811139) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25156 + ... + 32193.

It is an arithmetic number, because the mean of its divisors is an integer number (13419900).

Almost surely, 2^201811131 is an apocalyptic number.

201811131 is a deficient number, since it is larger than the sum of its proper divisors (120266469).

201811131 is a wasteful number, since it uses less digits than its factorization.

201811131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57395 (or 57392 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 201811131 is about 14206.0244614741. The cubic root of 201811131 is about 586.5635054849.

Adding to 201811131 its reverse (131118102), we get a palindrome (332929233).

It can be divided in two parts, 20181 and 1131, that added together give a palindrome (21312).

The spelling of 201811131 in words is "two hundred one million, eight hundred eleven thousand, one hundred thirty-one".