12649961 has 8 divisors (see below), whose sum is σ = 12826440. Its totient is φ = 12475008.

The previous prime is 12649957. The next prime is 12649963. The reversal of 12649961 is 16994621.

12649961 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 7155625 + 5494336 = 2675^2 + 2344^2 .

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 12649961 - 2² = 12649957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12649963) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30725 + ... + 31133.

It is an arithmetic number, because the mean of its divisors is an integer number (1603305).

Almost surely, 2^12649961 is an apocalyptic number.

It is an amenable number.

12649961 is a deficient number, since it is larger than the sum of its proper divisors (176479).

12649961 is a wasteful number, since it uses less digits than its factorization.

12649961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763.

The product of its digits is 23328, while the sum is 38.

The square root of 12649961 is about 3556.6783661163. The cubic root of 12649961 is about 233.0038312841.

The spelling of 12649961 in words is "twelve million, six hundred forty-nine thousand, nine hundred sixty-one".