201111491 has 16 divisors (see below), whose sum is σ = 238775040. Its totient is φ = 165732000.

The previous prime is 201111481. The next prime is 201111509. The reversal of 201111491 is 194111102.

It is not a de Polignac number, because 201111491 - 2¹⁸ = 200849347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201111451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48980 + ... + 52926.

It is an arithmetic number, because the mean of its divisors is an integer number (14923440).

Almost surely, 2^201111491 is an apocalyptic number.

201111491 is a deficient number, since it is larger than the sum of its proper divisors (37663549).

201111491 is a wasteful number, since it uses less digits than its factorization.

201111491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4234.

The product of its (nonzero) digits is 72, while the sum is 20.

The square root of 201111491 is about 14181.3783180620. The cubic root of 201111491 is about 585.8848867451.

Adding to 201111491 its reverse (194111102), we get a palindrome (395222593).

The spelling of 201111491 in words is "two hundred one million, one hundred eleven thousand, four hundred ninety-one".