52065821 has 4 divisors (see below), whose sum is σ = 52084092. Its totient is φ = 52047552.

The previous prime is 52065799. The next prime is 52065829. The reversal of 52065821 is 12856025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43428100 + 8637721 = 6590^2 + 2939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52065821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52065829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3836 + ... + 10901.

It is an arithmetic number, because the mean of its divisors is an integer number (13021023).

Almost surely, 2^52065821 is an apocalyptic number.

It is an amenable number.

52065821 is a deficient number, since it is larger than the sum of its proper divisors (18271).

52065821 is a wasteful number, since it uses less digits than its factorization.

52065821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18270.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 52065821 is about 7215.6649728213. The cubic root of 52065821 is about 373.4085349324.

The spelling of 52065821 in words is "fifty-two million, sixty-five thousand, eight hundred twenty-one".