12487961 has 4 divisors (see below), whose sum is σ = 12579252. Its totient is φ = 12396672.

The previous prime is 12487957. The next prime is 12487963. The reversal of 12487961 is 16978421.

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 3222025 + 9265936 = 1795^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 12487961 - 2² = 12487957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12487963) 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, 45440 + ... + 45713.

It is an arithmetic number, because the mean of its divisors is an integer number (3144813).

Almost surely, 2^12487961 is an apocalyptic number.

It is an amenable number.

12487961 is a deficient number, since it is larger than the sum of its proper divisors (91291).

12487961 is an equidigital number, since it uses as much as digits as its factorization.

12487961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91290.

The product of its digits is 24192, while the sum is 38.

The square root of 12487961 is about 3533.8309240822. The cubic root of 12487961 is about 232.0049109642.

The spelling of 12487961 in words is "twelve million, four hundred eighty-seven thousand, nine hundred sixty-one".