11285605 has 4 divisors (see below), whose sum is σ = 13542732. Its totient is φ = 9028480.

The previous prime is 11285597. The next prime is 11285609. The reversal of 11285605 is 50658211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50658211 = 593 ⋅85427.

It can be written as a sum of positive squares in 2 ways, for example, as 7717284 + 3568321 = 2778^2 + 1889^2 .

It is not a de Polignac number, because 11285605 - 2³ = 11285597 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 (11285609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1128556 + ... + 1128565.

It is an arithmetic number, because the mean of its divisors is an integer number (3385683).

Almost surely, 2^11285605 is an apocalyptic number.

It is an amenable number.

11285605 is a deficient number, since it is larger than the sum of its proper divisors (2257127).

11285605 is an equidigital number, since it uses as much as digits as its factorization.

11285605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257126.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 11285605 is about 3359.4054533503. The cubic root of 11285605 is about 224.3063741886.

It can be divided in two parts, 1 and 1285605, that added together give a triangular number (1285606 = T₁₆₀₃).

The spelling of 11285605 in words is "eleven million, two hundred eighty-five thousand, six hundred five".