105540191 has 4 divisors (see below), whose sum is σ = 108114384. Its totient is φ = 102966000.

The previous prime is 105540173. The next prime is 105540217. The reversal of 105540191 is 191045501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105540191 is a prime.

It is a super-2 number, since 2×105540191² = 22277463832632962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 105540191.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105540101) 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, 1287035 + ... + 1287116.

It is an arithmetic number, because the mean of its divisors is an integer number (27028596).

Almost surely, 2^105540191 is an apocalyptic number.

105540191 is a deficient number, since it is larger than the sum of its proper divisors (2574193).

105540191 is an equidigital number, since it uses as much as digits as its factorization.

105540191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574192.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 105540191 is about 10273.2755730585. The cubic root of 105540191 is about 472.5770481747.

Adding to 105540191 its reverse (191045501), we get a palindrome (296585692).

The spelling of 105540191 in words is "one hundred five million, five hundred forty thousand, one hundred ninety-one".