51180565 has 4 divisors (see below), whose sum is σ = 61416684. Its totient is φ = 40944448.

The previous prime is 51180541. The next prime is 51180581. The reversal of 51180565 is 56508115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56508115 = 5 ⋅11301623.

It can be written as a sum of positive squares in 2 ways, for example, as 22867524 + 28313041 = 4782^2 + 5321^2 .

It is a cyclic number.

It is not a de Polignac number, because 51180565 - 2²¹ = 49083413 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, 5118052 + ... + 5118061.

It is an arithmetic number, because the mean of its divisors is an integer number (15354171).

Almost surely, 2^51180565 is an apocalyptic number.

It is an amenable number.

51180565 is a deficient number, since it is larger than the sum of its proper divisors (10236119).

51180565 is a wasteful number, since it uses less digits than its factorization.

51180565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10236118.

The product of its (nonzero) digits is 6000, while the sum is 31.

The square root of 51180565 is about 7154.0593371875. The cubic root of 51180565 is about 371.2801167434.

The spelling of 51180565 in words is "fifty-one million, one hundred eighty thousand, five hundred sixty-five".