12155245 has 4 divisors (see below), whose sum is σ = 14586300. Its totient is φ = 9724192.

The previous prime is 12155237. The next prime is 12155257. The reversal of 12155245 is 54255121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54255121 = 43 ⋅1261747.

It can be written as a sum of positive squares in 2 ways, for example, as 6832996 + 5322249 = 2614^2 + 2307^2 .

It is a cyclic number.

It is not a de Polignac number, because 12155245 - 2³ = 12155237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1215520 + ... + 1215529.

It is an arithmetic number, because the mean of its divisors is an integer number (3646575).

Almost surely, 2^12155245 is an apocalyptic number.

It is an amenable number.

12155245 is a deficient number, since it is larger than the sum of its proper divisors (2431055).

12155245 is an equidigital number, since it uses as much as digits as its factorization.

12155245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2431054.

The product of its digits is 2000, while the sum is 25.

The square root of 12155245 is about 3486.4372932838. The cubic root of 12155245 is about 229.9259055596.

The spelling of 12155245 in words is "twelve million, one hundred fifty-five thousand, two hundred forty-five".