109861285 has 4 divisors (see below), whose sum is σ = 131833548. Its totient is φ = 87889024.

The previous prime is 109861273. The next prime is 109861289. The reversal of 109861285 is 582168901.

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 21538881 + 88322404 = 4641^2 + 9398^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109861285 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109861289) 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, 10986124 + ... + 10986133.

It is an arithmetic number, because the mean of its divisors is an integer number (32958387).

Almost surely, 2^109861285 is an apocalyptic number.

It is an amenable number.

109861285 is a deficient number, since it is larger than the sum of its proper divisors (21972263).

109861285 is an equidigital number, since it uses as much as digits as its factorization.

109861285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21972262.

The product of its (nonzero) digits is 34560, while the sum is 40.

The square root of 109861285 is about 10481.4734174161. The cubic root of 109861285 is about 478.9404943782.

The spelling of 109861285 in words is "one hundred nine million, eight hundred sixty-one thousand, two hundred eighty-five".