105056105491 has 4 divisors (see below), whose sum is σ = 105168226072. Its totient is φ = 104943984912.

The previous prime is 105056105477. The next prime is 105056105507. The reversal of 105056105491 is 194501650501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 194501650501 = 4111 ⋅47312491.

It is a cyclic number.

It is not a de Polignac number, because 105056105491 - 2²⁹ = 104519234579 is a prime.

It is a super-2 number, since 2×105056105491² (a number of 23 digits) 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 105056105491.

It is not an unprimeable number, because it can be changed into a prime (105056115491) 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 3 ways as a sum of consecutive naturals, for example, 56058885 + ... + 56060758.

It is an arithmetic number, because the mean of its divisors is an integer number (26292056518).

Almost surely, 2^105056105491 is an apocalyptic number.

105056105491 is a deficient number, since it is larger than the sum of its proper divisors (112120581).

105056105491 is an equidigital number, since it uses as much as digits as its factorization.

105056105491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112120580.

The product of its (nonzero) digits is 27000, while the sum is 37.

Adding to 105056105491 its reverse (194501650501), we get a palindrome (299557755992).

The spelling of 105056105491 in words is "one hundred five billion, fifty-six million, one hundred five thousand, four hundred ninety-one".