12156545 has 8 divisors (see below), whose sum is σ = 14610024. Its totient is φ = 9710464.

The previous prime is 12156527. The next prime is 12156553. The reversal of 12156545 is 54565121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 913936 + 11242609 = 956^2 + 3353^2 .

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 12156545 - 2⁸ = 12156289 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 2867 + ... + 5703.

It is an arithmetic number, because the mean of its divisors is an integer number (1826253).

Almost surely, 2^12156545 is an apocalyptic number.

It is an amenable number.

12156545 is a deficient number, since it is larger than the sum of its proper divisors (2453479).

12156545 is an equidigital number, since it uses as much as digits as its factorization.

12156545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3699.

The product of its digits is 6000, while the sum is 29.

The square root of 12156545 is about 3486.6237250383. The cubic root of 12156545 is about 229.9341021042.

The spelling of 12156545 in words is "twelve million, one hundred fifty-six thousand, five hundred forty-five".