11605861 has 4 divisors (see below), whose sum is σ = 11664972. Its totient is φ = 11546752.

The previous prime is 11605859. The next prime is 11605871. The reversal of 11605861 is 16850611.

11605861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16850611 = 2267 ⋅7433.

It can be written as a sum of positive squares in 2 ways, for example, as 10201636 + 1404225 = 3194^2 + 1185^2 .

It is a cyclic number.

It is not a de Polignac number, because 11605861 - 2¹ = 11605859 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 (11605801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29260 + ... + 29653.

It is an arithmetic number, because the mean of its divisors is an integer number (2916243).

Almost surely, 2^11605861 is an apocalyptic number.

It is an amenable number.

11605861 is a deficient number, since it is larger than the sum of its proper divisors (59111).

11605861 is an equidigital number, since it uses as much as digits as its factorization.

11605861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59110.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 11605861 is about 3406.7375889552. The cubic root of 11605861 is about 226.4083579450.

It can be divided in two parts, 1160 and 5861, that added together give a triangular number (7021 = T₁₁₈).

The spelling of 11605861 in words is "eleven million, six hundred five thousand, eight hundred sixty-one".