51016565 has 8 divisors (see below), whose sum is σ = 61355448. Its totient is φ = 40722880.

The previous prime is 51016543. The next prime is 51016571. The reversal of 51016565 is 56561015.

It can be written as a sum of positive squares in 4 ways, for example, as 2477476 + 48539089 = 1574^2 + 6967^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51016565 - 2²² = 46822261 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8762 + ... + 13371.

It is an arithmetic number, because the mean of its divisors is an integer number (7669431).

Almost surely, 2^51016565 is an apocalyptic number.

It is an amenable number.

51016565 is a deficient number, since it is larger than the sum of its proper divisors (10338883).

51016565 is a wasteful number, since it uses less digits than its factorization.

51016565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22599.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 51016565 is about 7142.5881163623. The cubic root of 51016565 is about 370.8831229981.

The spelling of 51016565 in words is "fifty-one million, sixteen thousand, five hundred sixty-five".