11681613 has 12 divisors (see below), whose sum is σ = 17048668. Its totient is φ = 7706880.

The previous prime is 11681611. The next prime is 11681623. The reversal of 11681613 is 31618611.

It can be written as a sum of positive squares in 2 ways, for example, as 3143529 + 8538084 = 1773^2 + 2922^2 .

It is not a de Polignac number, because 11681613 - 2¹ = 11681611 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 (11681611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5818 + ... + 7563.

Almost surely, 2^11681613 is an apocalyptic number.

It is an amenable number.

11681613 is a deficient number, since it is larger than the sum of its proper divisors (5367055).

11681613 is a wasteful number, since it uses less digits than its factorization.

11681613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13484 (or 13481 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 11681613 is about 3417.8374741933. The cubic root of 11681613 is about 226.8998827523.

The spelling of 11681613 in words is "eleven million, six hundred eighty-one thousand, six hundred thirteen".