201011191 has 4 divisors (see below), whose sum is σ = 209750832. Its totient is φ = 192271552.

The previous prime is 201011159. The next prime is 201011207. The reversal of 201011191 is 191110102.

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 201011191 - 2⁵ = 201011159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201011891) 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, 4369786 + ... + 4369831.

It is an arithmetic number, because the mean of its divisors is an integer number (52437708).

Almost surely, 2^201011191 is an apocalyptic number.

201011191 is a deficient number, since it is larger than the sum of its proper divisors (8739641).

201011191 is an equidigital number, since it uses as much as digits as its factorization.

201011191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8739640.

The product of its (nonzero) digits is 18, while the sum is 16.

The square root of 201011191 is about 14177.8415494038. The cubic root of 201011191 is about 585.7874714164.

Adding to 201011191 its reverse (191110102), we get a palindrome (392121293).

The spelling of 201011191 in words is "two hundred one million, eleven thousand, one hundred ninety-one".