12212545 has 8 divisors (see below), whose sum is σ = 15517224. Its totient is φ = 9195264.

The previous prime is 12212539. The next prime is 12212549. The reversal of 12212545 is 54521221.

It can be written as a sum of positive squares in 4 ways, for example, as 6848689 + 5363856 = 2617^2 + 2316^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12212545 - 2¹⁵ = 12179777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12212549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71754 + ... + 71923.

It is an arithmetic number, because the mean of its divisors is an integer number (1939653).

Almost surely, 2^12212545 is an apocalyptic number.

It is an amenable number.

12212545 is a deficient number, since it is larger than the sum of its proper divisors (3304679).

12212545 is a wasteful number, since it uses less digits than its factorization.

12212545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143699.

The product of its digits is 800, while the sum is 22.

The square root of 12212545 is about 3494.6451894291. The cubic root of 12212545 is about 230.2866306744.

Adding to 12212545 its reverse (54521221), we get a palindrome (66733766).

The spelling of 12212545 in words is "twelve million, two hundred twelve thousand, five hundred forty-five".