51800565 has 8 divisors (see below), whose sum is σ = 82880928. Its totient is φ = 27626960.

The previous prime is 51800527. The next prime is 51800569. The reversal of 51800565 is 56500815.

It is a happy number.

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

It is not a de Polignac number, because 51800565 - 2⁶ = 51800501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51800569) 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, 1726671 + ... + 1726700.

It is an arithmetic number, because the mean of its divisors is an integer number (10360116).

Almost surely, 2^51800565 is an apocalyptic number.

It is an amenable number.

51800565 is a deficient number, since it is larger than the sum of its proper divisors (31080363).

51800565 is a wasteful number, since it uses less digits than its factorization.

51800565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453379.

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 51800565 is about 7197.2609373289. The cubic root of 51800565 is about 372.7733291113.

The spelling of 51800565 in words is "fifty-one million, eight hundred thousand, five hundred sixty-five".