12001181 has 4 divisors (see below), whose sum is σ = 12043872. Its totient is φ = 11958492.

The previous prime is 12001177. The next prime is 12001189. The reversal of 12001181 is 18110021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12001181 - 2² = 12001177 is a prime.

It is a super-2 number, since 2×12001181² = 288056690789522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001189) 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, 20921 + ... + 21486.

It is an arithmetic number, because the mean of its divisors is an integer number (3010968).

Almost surely, 2^12001181 is an apocalyptic number.

It is an amenable number.

12001181 is a deficient number, since it is larger than the sum of its proper divisors (42691).

12001181 is an equidigital number, since it uses as much as digits as its factorization.

12001181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42690.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 12001181 is about 3464.2720736108. The cubic root of 12001181 is about 228.9503588616.

The spelling of 12001181 in words is "twelve million, one thousand, one hundred eighty-one".