51895565 has 8 divisors (see below), whose sum is σ = 62672280. Its totient is φ = 41251392.

The previous prime is 51895561. The next prime is 51895573. The reversal of 51895565 is 56559815.

It can be written as a sum of positive squares in 4 ways, for example, as 4519876 + 47375689 = 2126^2 + 6883^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51895565 - 2² = 51895561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51895561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32270 + ... + 33839.

It is an arithmetic number, because the mean of its divisors is an integer number (7834035).

Almost surely, 2^51895565 is an apocalyptic number.

It is an amenable number.

51895565 is a deficient number, since it is larger than the sum of its proper divisors (10776715).

51895565 is a wasteful number, since it uses less digits than its factorization.

51895565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66271.

The product of its digits is 270000, while the sum is 44.

The square root of 51895565 is about 7203.8576471221. The cubic root of 51895565 is about 373.0010733413.

The spelling of 51895565 in words is "fifty-one million, eight hundred ninety-five thousand, five hundred sixty-five".