105491127845 has 4 divisors (see below), whose sum is σ = 126589353420. Its totient is φ = 84392902272.

The previous prime is 105491127829. The next prime is 105491127851. The reversal of 105491127845 is 548721194501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548721194501 = 5039 ⋅108894859.

It can be written as a sum of positive squares in 2 ways, for example, as 19004552449 + 86486575396 = 137857^2 + 294086^2 .

It is a cyclic number.

It is not a de Polignac number, because 105491127845 - 2⁴ = 105491127829 is a prime.

It is a super-2 number, since 2×105491127845² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 105491127845.

It is a congruent number.

It is an unprimeable number.

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, 10549112780 + ... + 10549112789.

It is an arithmetic number, because the mean of its divisors is an integer number (31647338355).

Almost surely, 2^105491127845 is an apocalyptic number.

It is an amenable number.

105491127845 is a deficient number, since it is larger than the sum of its proper divisors (21098225575).

105491127845 is an equidigital number, since it uses as much as digits as its factorization.

105491127845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21098225574.

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 105491127845 in words is "one hundred five billion, four hundred ninety-one million, one hundred twenty-seven thousand, eight hundred forty-five".