12155525 has 6 divisors (see below), whose sum is σ = 15072882. Its totient is φ = 9724400.

The previous prime is 12155519. The next prime is 12155537. The reversal of 12155525 is 52555121.

It can be written as a sum of positive squares in 3 ways, for example, as 2427364 + 9728161 = 1558^2 + 3119^2 .

It is not a de Polignac number, because 12155525 - 2⁴ = 12155509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12155494 and 12155503.

It is a congruent 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 5 ways as a sum of consecutive naturals, for example, 243086 + ... + 243135.

It is an arithmetic number, because the mean of its divisors is an integer number (2512147).

Almost surely, 2^12155525 is an apocalyptic number.

It is an amenable number.

12155525 is a deficient number, since it is larger than the sum of its proper divisors (2917357).

12155525 is an equidigital number, since it uses as much as digits as its factorization.

12155525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486231 (or 486226 counting only the distinct ones).

The product of its digits is 2500, while the sum is 26.

The square root of 12155525 is about 3486.4774486579. The cubic root of 12155525 is about 229.9276710186.

The spelling of 12155525 in words is "twelve million, one hundred fifty-five thousand, five hundred twenty-five".