105609857 has 4 divisors (see below), whose sum is σ = 105822000. Its totient is φ = 105397716.

The previous prime is 105609841. The next prime is 105609863. The reversal of 105609857 is 758906501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 758906501 = 139 ⋅5459759.

It is a cyclic number.

It is not a de Polignac number, because 105609857 - 2⁴ = 105609841 is a prime.

It is a super-2 number, since 2×105609857² = 22306883791120898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105609887) 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 3 ways as a sum of consecutive naturals, for example, 105323 + ... + 106320.

It is an arithmetic number, because the mean of its divisors is an integer number (26455500).

Almost surely, 2^105609857 is an apocalyptic number.

It is an amenable number.

105609857 is a deficient number, since it is larger than the sum of its proper divisors (212143).

105609857 is an equidigital number, since it uses as much as digits as its factorization.

105609857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212142.

The product of its (nonzero) digits is 75600, while the sum is 41.

The square root of 105609857 is about 10276.6656557465. The cubic root of 105609857 is about 472.6810063952.

The spelling of 105609857 in words is "one hundred five million, six hundred nine thousand, eight hundred fifty-seven".