12920181 has 16 divisors (see below), whose sum is σ = 18320256. Its totient is φ = 8081216.

The previous prime is 12920177. The next prime is 12920183. The reversal of 12920181 is 18102921.

12920181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12920181 - 2² = 12920177 is a prime.

It is a super-2 number, since 2×12920181² = 333862154145522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12920183) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1891 + ... + 5423.

It is an arithmetic number, because the mean of its divisors is an integer number (1145016).

Almost surely, 2^12920181 is an apocalyptic number.

It is an amenable number.

12920181 is a deficient number, since it is larger than the sum of its proper divisors (5400075).

12920181 is a wasteful number, since it uses less digits than its factorization.

12920181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 12920181 is about 3594.4653288076. The cubic root of 12920181 is about 234.6512466821.

The spelling of 12920181 in words is "twelve million, nine hundred twenty thousand, one hundred eighty-one".