123871105 has 4 divisors (see below), whose sum is σ = 148645332. Its totient is φ = 99096880.

The previous prime is 123871103. The next prime is 123871117. The reversal of 123871105 is 501178321.

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 74857104 + 49014001 = 8652^2 + 7001^2 .

It is not a de Polignac number, because 123871105 - 2¹ = 123871103 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123871103) 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, 12387106 + ... + 12387115.

It is an arithmetic number, because the mean of its divisors is an integer number (37161333).

Almost surely, 2^123871105 is an apocalyptic number.

It is an amenable number.

123871105 is a deficient number, since it is larger than the sum of its proper divisors (24774227).

123871105 is an equidigital number, since it uses as much as digits as its factorization.

123871105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24774226.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 123871105 is about 11129.7396645205. The cubic root of 123871105 is about 498.4902525804.

The spelling of 123871105 in words is "one hundred twenty-three million, eight hundred seventy-one thousand, one hundred five".