51359785 has 4 divisors (see below), whose sum is σ = 61631748. Its totient is φ = 41087824.

The previous prime is 51359779. The next prime is 51359797. The reversal of 51359785 is 58795315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7958041 + 43401744 = 2821^2 + 6588^2 .

It is a cyclic number.

It is not a de Polignac number, because 51359785 - 2¹¹ = 51357737 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, 5135974 + ... + 5135983.

It is an arithmetic number, because the mean of its divisors is an integer number (15407937).

Almost surely, 2^51359785 is an apocalyptic number.

It is an amenable number.

51359785 is a deficient number, since it is larger than the sum of its proper divisors (10271963).

51359785 is a wasteful number, since it uses less digits than its factorization.

51359785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10271962.

The product of its digits is 189000, while the sum is 43.

The square root of 51359785 is about 7166.5741466896. The cubic root of 51359785 is about 371.7129848589.

The spelling of 51359785 in words is "fifty-one million, three hundred fifty-nine thousand, seven hundred eighty-five".