51056605 has 4 divisors (see below), whose sum is σ = 61267932. Its totient is φ = 40845280.

The previous prime is 51056569. The next prime is 51056623. The reversal of 51056605 is 50665015.

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 9865881 + 41190724 = 3141^2 + 6418^2 .

It is not a de Polignac number, because 51056605 - 2¹⁵ = 51023837 is a prime.

It is a Duffinian number.

It is a congruent 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, 5105656 + ... + 5105665.

It is an arithmetic number, because the mean of its divisors is an integer number (15316983).

Almost surely, 2^51056605 is an apocalyptic number.

It is an amenable number.

51056605 is a deficient number, since it is larger than the sum of its proper divisors (10211327).

51056605 is a wasteful number, since it uses less digits than its factorization.

51056605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10211326.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 51056605 is about 7145.3904721855. The cubic root of 51056605 is about 370.9801259809.

The spelling of 51056605 in words is "fifty-one million, fifty-six thousand, six hundred five".