11517661 has 8 divisors (see below), whose sum is σ = 11733120. Its totient is φ = 11304192.

The previous prime is 11517659. The next prime is 11517673. The reversal of 11517661 is 16671511.

It is the 1386-th star number.

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 11517661 - 2¹ = 11517659 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 (11517601) 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, 15660 + ... + 16378.

It is an arithmetic number, because the mean of its divisors is an integer number (1466640).

Almost surely, 2^11517661 is an apocalyptic number.

It is an amenable number.

11517661 is a deficient number, since it is larger than the sum of its proper divisors (215459).

11517661 is an equidigital number, since it uses as much as digits as its factorization.

11517661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 995.

The product of its digits is 1260, while the sum is 28.

The square root of 11517661 is about 3393.7679649617. The cubic root of 11517661 is about 225.8333605963.

The spelling of 11517661 in words is "eleven million, five hundred seventeen thousand, six hundred sixty-one".