201105891 has 12 divisors (see below), whose sum is σ = 331984432. Its totient is φ = 114917616.

The previous prime is 201105889. The next prime is 201105953. The reversal of 201105891 is 198501102.

It is not a de Polignac number, because 201105891 - 2¹ = 201105889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201105871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1596016 + ... + 1596141.

Almost surely, 2^201105891 is an apocalyptic number.

201105891 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

201105891 is a deficient number, since it is larger than the sum of its proper divisors (130878541).

201105891 is a wasteful number, since it uses less digits than its factorization.

201105891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3192170 (or 3192167 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 27.

The square root of 201105891 is about 14181.1808746663. The cubic root of 201105891 is about 585.8794486573.

Adding to 201105891 its reverse (198501102), we get a palindrome (399606993).

The spelling of 201105891 in words is "two hundred one million, one hundred five thousand, eight hundred ninety-one".