12149561 has 4 divisors (see below), whose sum is σ = 12378852. Its totient is φ = 11920272.

The previous prime is 12149539. The next prime is 12149563. The reversal of 12149561 is 16594121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9765625 + 2383936 = 3125^2 + 1544^2 .

It is a cyclic number.

It is not a de Polignac number, because 12149561 - 2¹⁰ = 12148537 is a prime.

It is a super-2 number, since 2×12149561² = 295223664985442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12149563) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 114566 + ... + 114671.

It is an arithmetic number, because the mean of its divisors is an integer number (3094713).

Almost surely, 2^12149561 is an apocalyptic number.

It is an amenable number.

12149561 is a deficient number, since it is larger than the sum of its proper divisors (229291).

12149561 is an equidigital number, since it uses as much as digits as its factorization.

12149561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229290.

The product of its digits is 2160, while the sum is 29.

The square root of 12149561 is about 3485.6220391775. The cubic root of 12149561 is about 229.8900608794.

The spelling of 12149561 in words is "twelve million, one hundred forty-nine thousand, five hundred sixty-one".