51040565 has 16 divisors (see below), whose sum is σ = 64108800. Its totient is φ = 39010576.

The previous prime is 51040547. The next prime is 51040573. The reversal of 51040565 is 56504015.

It is not a de Polignac number, because 51040565 - 2¹⁸ = 50778421 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 60416 + ... + 61254.

It is an arithmetic number, because the mean of its divisors is an integer number (4006800).

Almost surely, 2^51040565 is an apocalyptic number.

It is an amenable number.

51040565 is a deficient number, since it is larger than the sum of its proper divisors (13068235).

51040565 is an frugal number, since it uses more digits than its factorization.

51040565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 51040565 is about 7144.2679820959. The cubic root of 51040565 is about 370.9412727351.

The spelling of 51040565 in words is "fifty-one million, forty thousand, five hundred sixty-five".