12611521 has 8 divisors (see below), whose sum is σ = 14172480. Its totient is φ = 11134992.

The previous prime is 12611519. The next prime is 12611581. The reversal of 12611521 is 12511621.

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 12611521 - 2¹ = 12611519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12611581) 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, 20791 + ... + 21388.

It is an arithmetic number, because the mean of its divisors is an integer number (1771560).

Almost surely, 2^12611521 is an apocalyptic number.

It is an amenable number.

12611521 is a deficient number, since it is larger than the sum of its proper divisors (1560959).

12611521 is a wasteful number, since it uses less digits than its factorization.

12611521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42215.

The product of its digits is 120, while the sum is 19.

The square root of 12611521 is about 3551.2703360910. The cubic root of 12611521 is about 232.7675787780.

The spelling of 12611521 in words is "twelve million, six hundred eleven thousand, five hundred twenty-one".