51704821 has 8 divisors (see below), whose sum is σ = 59136704. Its totient is φ = 44284320.

The previous prime is 51704819. The next prime is 51704911. The reversal of 51704821 is 12840715.

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 51704821 - 2¹ = 51704819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51704821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51704801) 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, 12241 + ... + 15913.

It is an arithmetic number, because the mean of its divisors is an integer number (7392088).

Almost surely, 2^51704821 is an apocalyptic number.

It is an amenable number.

51704821 is a deficient number, since it is larger than the sum of its proper divisors (7431883).

51704821 is a wasteful number, since it uses less digits than its factorization.

51704821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5691.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 51704821 is about 7190.6064417405. The cubic root of 51704821 is about 372.5435193813.

It can be divided in two parts, 51704 and 821, that added together give a palindrome (52525).

The spelling of 51704821 in words is "fifty-one million, seven hundred four thousand, eight hundred twenty-one".