53320561 has 16 divisors (see below), whose sum is σ = 61969536. Its totient is φ = 44937216.

The previous prime is 53320549. The next prime is 53320583. The reversal of 53320561 is 16502335.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 53320561 - 2⁵ = 53320529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53321561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 192355 + ... + 192631.

It is an arithmetic number, because the mean of its divisors is an integer number (3873096).

Almost surely, 2^53320561 is an apocalyptic number.

It is an amenable number.

53320561 is a deficient number, since it is larger than the sum of its proper divisors (8648975).

53320561 is a wasteful number, since it uses less digits than its factorization.

53320561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648.

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 53320561 is about 7302.0929191568. The cubic root of 53320561 is about 376.3843610888.

Adding to 53320561 its reverse (16502335), we get a palindrome (69822896).

The spelling of 53320561 in words is "fifty-three million, three hundred twenty thousand, five hundred sixty-one".