52668521 has 4 divisors (see below), whose sum is σ = 52684500. Its totient is φ = 52652544.

The previous prime is 52668487. The next prime is 52668547. The reversal of 52668521 is 12586625.

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 38688400 + 13980121 = 6220^2 + 3739^2 .

It is a cyclic number.

It is not a de Polignac number, because 52668521 - 2¹⁰ = 52667497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52668221) 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, 1016 + ... + 10313.

It is an arithmetic number, because the mean of its divisors is an integer number (13171125).

Almost surely, 2^52668521 is an apocalyptic number.

It is an amenable number.

52668521 is a deficient number, since it is larger than the sum of its proper divisors (15979).

52668521 is a wasteful number, since it uses less digits than its factorization.

52668521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15978.

The product of its digits is 28800, while the sum is 35.

The square root of 52668521 is about 7257.3081097608. The cubic root of 52668521 is about 374.8438366066.

The spelling of 52668521 in words is "fifty-two million, six hundred sixty-eight thousand, five hundred twenty-one".