51605585 has 4 divisors (see below), whose sum is σ = 61926708. Its totient is φ = 41284464.

The previous prime is 51605551. The next prime is 51605641. The reversal of 51605585 is 58550615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58550615 = 5 ⋅11710123.

It can be written as a sum of positive squares in 2 ways, for example, as 31820881 + 19784704 = 5641^2 + 4448^2 .

It is a cyclic number.

It is not a de Polignac number, because 51605585 - 2¹⁰ = 51604561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 5160554 + ... + 5160563.

It is an arithmetic number, because the mean of its divisors is an integer number (15481677).

Almost surely, 2^51605585 is an apocalyptic number.

It is an amenable number.

51605585 is a deficient number, since it is larger than the sum of its proper divisors (10321123).

51605585 is a wasteful number, since it uses less digits than its factorization.

51605585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10321122.

The product of its (nonzero) digits is 30000, while the sum is 35.

The square root of 51605585 is about 7183.7027360547. The cubic root of 51605585 is about 372.3050283665.

The spelling of 51605585 in words is "fifty-one million, six hundred five thousand, five hundred eighty-five".