53509681 has 8 divisors (see below), whose sum is σ = 56826720. Its totient is φ = 50242752.

The previous prime is 53509679. The next prime is 53509721. The reversal of 53509681 is 18690535.

53509681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 53509681 - 2¹ = 53509679 is a prime.

It is a super-2 number, since 2×53509681² = 5726571921443522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 53509681.

It is not an unprimeable number, because it can be changed into a prime (53509601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10315 + ... + 14608.

It is an arithmetic number, because the mean of its divisors is an integer number (7103340).

Almost surely, 2^53509681 is an apocalyptic number.

It is an amenable number.

53509681 is a deficient number, since it is larger than the sum of its proper divisors (3317039).

53509681 is a wasteful number, since it uses less digits than its factorization.

53509681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25055.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 53509681 is about 7315.0311687648. The cubic root of 53509681 is about 376.8288288978.

The spelling of 53509681 in words is "fifty-three million, five hundred nine thousand, six hundred eighty-one".