105889921 has 4 divisors (see below), whose sum is σ = 108472644. Its totient is φ = 103307200.

The previous prime is 105889877. The next prime is 105889969. The reversal of 105889921 is 129988501.

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 2359296 + 103530625 = 1536^2 + 10175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105889921 is a prime.

It is a super-2 number, since 2×105889921² = 22425350738772482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105889981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291300 + ... + 1291381.

It is an arithmetic number, because the mean of its divisors is an integer number (27118161).

Almost surely, 2^105889921 is an apocalyptic number.

It is an amenable number.

105889921 is a deficient number, since it is larger than the sum of its proper divisors (2582723).

105889921 is an equidigital number, since it uses as much as digits as its factorization.

105889921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2582722.

The product of its (nonzero) digits is 51840, while the sum is 43.

The square root of 105889921 is about 10290.2828435374. The cubic root of 105889921 is about 473.0984677006.

The spelling of 105889921 in words is "one hundred five million, eight hundred eighty-nine thousand, nine hundred twenty-one".