52109681 has 4 divisors (see below), whose sum is σ = 56118132. Its totient is φ = 48101232.

The previous prime is 52109671. The next prime is 52109683. The reversal of 52109681 is 18690125.

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 19219456 + 32890225 = 4384^2 + 5735^2 .

It is a cyclic number.

It is not a de Polignac number, because 52109681 - 2¹⁴ = 52093297 is a prime.

It is a super-2 number, since 2×52109681² = 5430837707843522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52109683) 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, 2004206 + ... + 2004231.

It is an arithmetic number, because the mean of its divisors is an integer number (14029533).

Almost surely, 2^52109681 is an apocalyptic number.

It is an amenable number.

52109681 is a deficient number, since it is larger than the sum of its proper divisors (4008451).

52109681 is a wasteful number, since it uses less digits than its factorization.

52109681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008450.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 52109681 is about 7218.7035539631. The cubic root of 52109681 is about 373.5133580284.

The spelling of 52109681 in words is "fifty-two million, one hundred nine thousand, six hundred eighty-one".