12208813 has 2 divisors, whose sum is σ = 12208814. Its totient is φ = 12208812.

The previous prime is 12208799. The next prime is 12208817. The reversal of 12208813 is 31880221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11573604 + 635209 = 3402^2 + 797^2 .

It is an emirp because it is prime and its reverse (31880221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12208813 - 2¹³ = 12200621 is a prime.

It is a super-2 number, since 2×12208813² = 298110229737938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12208817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6104406 + 6104407.

It is an arithmetic number, because the mean of its divisors is an integer number (6104407).

Almost surely, 2^12208813 is an apocalyptic number.

It is an amenable number.

12208813 is a deficient number, since it is larger than the sum of its proper divisors (1).

12208813 is an equidigital number, since it uses as much as digits as its factorization.

12208813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 12208813 is about 3494.1111888433. Note that the first 4 decimals coincide. The cubic root of 12208813 is about 230.2631707195.

The spelling of 12208813 in words is "twelve million, two hundred eight thousand, eight hundred thirteen".