105687881 has 4 divisors (see below), whose sum is σ = 113817732. Its totient is φ = 97558032.

The previous prime is 105687871. The next prime is 105687887. The reversal of 105687881 is 188786501.

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 6864400 + 98823481 = 2620^2 + 9941^2 .

It is not a de Polignac number, because 105687881 - 2¹⁴ = 105671497 is a prime.

It is a super-2 number, since 2×105687881² = 22339856380540322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105687887) 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, 4064906 + ... + 4064931.

It is an arithmetic number, because the mean of its divisors is an integer number (28454433).

Almost surely, 2^105687881 is an apocalyptic number.

It is an amenable number.

105687881 is a deficient number, since it is larger than the sum of its proper divisors (8129851).

105687881 is an equidigital number, since it uses as much as digits as its factorization.

105687881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8129850.

The product of its (nonzero) digits is 107520, while the sum is 44.

The square root of 105687881 is about 10280.4611277899. The cubic root of 105687881 is about 472.7973824774.

The spelling of 105687881 in words is "one hundred five million, six hundred eighty-seven thousand, eight hundred eighty-one".