12187801 has 4 divisors (see below), whose sum is σ = 12608100. Its totient is φ = 11767504.

The previous prime is 12187787. The next prime is 12187811. The reversal of 12187801 is 10878121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10878121 = 571 ⋅19051.

It can be written as a sum of positive squares in 2 ways, for example, as 8761600 + 3426201 = 2960^2 + 1851^2 .

It is not a de Polignac number, because 12187801 - 2⁹ = 12187289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12187801.

It is not an unprimeable number, because it can be changed into a prime (12187811) 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, 210106 + ... + 210163.

It is an arithmetic number, because the mean of its divisors is an integer number (3152025).

Almost surely, 2^12187801 is an apocalyptic number.

It is an amenable number.

12187801 is a deficient number, since it is larger than the sum of its proper divisors (420299).

12187801 is an equidigital number, since it uses as much as digits as its factorization.

12187801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420298.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 12187801 is about 3491.1031207915. The cubic root of 12187801 is about 230.1309965802.

The spelling of 12187801 in words is "twelve million, one hundred eighty-seven thousand, eight hundred one".