12101605 has 4 divisors (see below), whose sum is σ = 14521932. Its totient is φ = 9681280.

The previous prime is 12101591. The next prime is 12101641. The reversal of 12101605 is 50610121.

It is a happy number.

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 1454436 + 10647169 = 1206^2 + 3263^2 .

It is not a de Polignac number, because 12101605 - 2⁷ = 12101477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1210156 + ... + 1210165.

It is an arithmetic number, because the mean of its divisors is an integer number (3630483).

Almost surely, 2^12101605 is an apocalyptic number.

It is an amenable number.

12101605 is a deficient number, since it is larger than the sum of its proper divisors (2420327).

12101605 is an equidigital number, since it uses as much as digits as its factorization.

12101605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420326.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 12101605 is about 3478.7361210647. The cubic root of 12101605 is about 229.5871927382.

Adding to 12101605 its reverse (50610121), we get a palindrome (62711726).

The spelling of 12101605 in words is "twelve million, one hundred one thousand, six hundred five".