105171989 has 8 divisors (see below), whose sum is σ = 114696960. Its totient is φ = 95852016.

The previous prime is 105171949. The next prime is 105172003. The reversal of 105171989 is 989171501.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-105171989 is a prime.

It is a super-2 number, since 2×105171989² = 22122294540432242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105171949) 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 7 ways as a sum of consecutive naturals, for example, 50177 + ... + 52230.

It is an arithmetic number, because the mean of its divisors is an integer number (14337120).

Almost surely, 2^105171989 is an apocalyptic number.

It is an amenable number.

105171989 is a deficient number, since it is larger than the sum of its proper divisors (9524971).

105171989 is a wasteful number, since it uses less digits than its factorization.

105171989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102499.

The product of its (nonzero) digits is 22680, while the sum is 41.

The square root of 105171989 is about 10255.3395360661. The cubic root of 105171989 is about 472.0268421128.

The spelling of 105171989 in words is "one hundred five million, one hundred seventy-one thousand, nine hundred eighty-nine".