12187501 has 4 divisors (see below), whose sum is σ = 12369472. Its totient is φ = 12005532.

The previous prime is 12187489. The next prime is 12187507. The reversal of 12187501 is 10578121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10578121 = 1549 ⋅6829.

It is a cyclic number.

It is not a de Polignac number, because 12187501 - 2¹⁵ = 12154733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12187507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90885 + ... + 91018.

It is an arithmetic number, because the mean of its divisors is an integer number (3092368).

Almost surely, 2^12187501 is an apocalyptic number.

It is an amenable number.

12187501 is a deficient number, since it is larger than the sum of its proper divisors (181971).

12187501 is an equidigital number, since it uses as much as digits as its factorization.

12187501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181970.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 12187501 is about 3491.0601541652. The cubic root of 12187501 is about 230.1291083570.

The spelling of 12187501 in words is "twelve million, one hundred eighty-seven thousand, five hundred one".