12091601 has 4 divisors (see below), whose sum is σ = 12110772. Its totient is φ = 12072432.

The previous prime is 12091591. The next prime is 12091621. The reversal of 12091601 is 10619021.

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 3097600 + 8994001 = 1760^2 + 2999^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12091601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12091621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8606 + ... + 9911.

It is an arithmetic number, because the mean of its divisors is an integer number (3027693).

Almost surely, 2^12091601 is an apocalyptic number.

It is an amenable number.

12091601 is a deficient number, since it is larger than the sum of its proper divisors (19171).

12091601 is an equidigital number, since it uses as much as digits as its factorization.

12091601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19170.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 12091601 is about 3477.2979452443. The cubic root of 12091601 is about 229.5239112297.

The spelling of 12091601 in words is "twelve million, ninety-one thousand, six hundred one".