105511945 has 80 divisors (see below), whose sum is σ = 174244608. Its totient is φ = 60587520.

The previous prime is 105511933. The next prime is 105511949. The reversal of 105511945 is 549115501.

It is not a de Polignac number, because 105511945 - 2¹⁹ = 104987657 is a prime.

It is a super-2 number, since 2×105511945² = 22265541075366050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105511949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2244912 + ... + 2244958.

Almost surely, 2^105511945 is an apocalyptic number.

It is an amenable number.

105511945 is a deficient number, since it is larger than the sum of its proper divisors (68732663).

105511945 is an equidigital number, since it uses as much as digits as its factorization.

105511945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 31.

The square root of 105511945 is about 10271.9007491311. The cubic root of 105511945 is about 472.5348853987.

The spelling of 105511945 in words is "one hundred five million, five hundred eleven thousand, nine hundred forty-five".