11616581 has 8 divisors (see below), whose sum is σ = 12312000. Its totient is φ = 10929600.

The previous prime is 11616551. The next prime is 11616589. The reversal of 11616581 is 18561611.

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 11616581 - 2¹⁰ = 11615557 is a prime.

It is a super-2 number, since 2×11616581² = 269889908259122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11616589) 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, 845 + ... + 4893.

It is an arithmetic number, because the mean of its divisors is an integer number (1539000).

Almost surely, 2^11616581 is an apocalyptic number.

It is an amenable number.

11616581 is a deficient number, since it is larger than the sum of its proper divisors (695419).

11616581 is a wasteful number, since it uses less digits than its factorization.

11616581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4219.

The product of its digits is 1440, while the sum is 29.

The square root of 11616581 is about 3408.3105785711. The cubic root of 11616581 is about 226.4780454560.

The spelling of 11616581 in words is "eleven million, six hundred sixteen thousand, five hundred eighty-one".