12215173 has 2 divisors, whose sum is σ = 12215174. Its totient is φ = 12215172.

The previous prime is 12215167. The next prime is 12215179. The reversal of 12215173 is 37151221.

It is a happy number.

12215173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (12215167) and next prime (12215179).

It can be written as a sum of positive squares in only one way, i.e., 8282884 + 3932289 = 2878^2 + 1983^2 .

It is an emirp because it is prime and its reverse (37151221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12215173 - 2⁵ = 12215141 is a prime.

It is equal to p₈₀₁₂₂₉ and since 12215173 and 801229 have the same sum of digits, it is a Honaker prime.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12215179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6107586 + 6107587.

It is an arithmetic number, because the mean of its divisors is an integer number (6107587).

Almost surely, 2^12215173 is an apocalyptic number.

It is an amenable number.

12215173 is a deficient number, since it is larger than the sum of its proper divisors (1).

12215173 is an equidigital number, since it uses as much as digits as its factorization.

12215173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 22.

The square root of 12215173 is about 3495.0211730403. The cubic root of 12215173 is about 230.3031478393.

Adding to 12215173 its reverse (37151221), we get a palindrome (49366394).

The spelling of 12215173 in words is "twelve million, two hundred fifteen thousand, one hundred seventy-three".