13664961 has 6 divisors (see below), whose sum is σ = 19738290. Its totient is φ = 9109968.

The previous prime is 13664953. The next prime is 13664969. The reversal of 13664961 is 16946631.

13664961 is a `hidden beast` number, since 1 + 3 + 6 + 649 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (13664953) and next prime (13664969).

It can be written as a sum of positive squares in only one way, i.e., 13395600 + 269361 = 3660^2 + 519^2 .

It is not a de Polignac number, because 13664961 - 2³ = 13664953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13664969) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 759156 + ... + 759173.

It is an arithmetic number, because the mean of its divisors is an integer number (3289715).

Almost surely, 2^13664961 is an apocalyptic number.

It is an amenable number.

13664961 is a deficient number, since it is larger than the sum of its proper divisors (6073329).

13664961 is a wasteful number, since it uses less digits than its factorization.

13664961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1518335 (or 1518332 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 13664961 is about 3696.6148027621. The cubic root of 13664961 is about 239.0760832215.

The spelling of 13664961 in words is "thirteen million, six hundred sixty-four thousand, nine hundred sixty-one".