105918905 has 4 divisors (see below), whose sum is σ = 127102692. Its totient is φ = 84735120.

The previous prime is 105918877. The next prime is 105918913. The reversal of 105918905 is 509819501.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24720784 + 81198121 = 4972^2 + 9011^2 .

It is not a de Polignac number, because 105918905 - 2⁸ = 105918649 is a prime.

It is a super-2 number, since 2×105918905² = 22437628872798050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10591886 + ... + 10591895.

It is an arithmetic number, because the mean of its divisors is an integer number (31775673).

Almost surely, 2^105918905 is an apocalyptic number.

It is an amenable number.

105918905 is a deficient number, since it is larger than the sum of its proper divisors (21183787).

105918905 is an equidigital number, since it uses as much as digits as its factorization.

105918905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21183786.

The product of its (nonzero) digits is 16200, while the sum is 38.

The square root of 105918905 is about 10291.6910660979. The cubic root of 105918905 is about 473.1416289853.

The spelling of 105918905 in words is "one hundred five million, nine hundred eighteen thousand, nine hundred five".