51905585 has 4 divisors (see below), whose sum is σ = 62286708. Its totient is φ = 41524464.

The previous prime is 51905537. The next prime is 51905591. The reversal of 51905585 is 58550915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58550915 = 5 ⋅11710183.

It can be written as a sum of positive squares in 2 ways, for example, as 7376656 + 44528929 = 2716^2 + 6673^2 .

It is a cyclic number.

It is not a de Polignac number, because 51905585 - 2⁶ = 51905521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5190554 + ... + 5190563.

It is an arithmetic number, because the mean of its divisors is an integer number (15571677).

Almost surely, 2^51905585 is an apocalyptic number.

It is an amenable number.

51905585 is a deficient number, since it is larger than the sum of its proper divisors (10381123).

51905585 is a wasteful number, since it uses less digits than its factorization.

51905585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10381122.

The product of its (nonzero) digits is 45000, while the sum is 38.

The square root of 51905585 is about 7204.5530742719. The cubic root of 51905585 is about 373.0250781558.

The spelling of 51905585 in words is "fifty-one million, nine hundred five thousand, five hundred eighty-five".