53516321 has 4 divisors (see below), whose sum is σ = 54270144. Its totient is φ = 52762500.

The previous prime is 53516311. The next prime is 53516341. The reversal of 53516321 is 12361535.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53516321 - 2¹⁴ = 53499937 is a prime.

It is a super-2 number, since 2×53516321² = 5727993226750082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53516311) 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, 376805 + ... + 376946.

It is an arithmetic number, because the mean of its divisors is an integer number (13567536).

Almost surely, 2^53516321 is an apocalyptic number.

It is an amenable number.

53516321 is a deficient number, since it is larger than the sum of its proper divisors (753823).

53516321 is an equidigital number, since it uses as much as digits as its factorization.

53516321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753822.

The product of its digits is 2700, while the sum is 26.

The square root of 53516321 is about 7315.4850146795. The cubic root of 53516321 is about 376.8444151112.

Adding to 53516321 its reverse (12361535), we get a palindrome (65877856).

The spelling of 53516321 in words is "fifty-three million, five hundred sixteen thousand, three hundred twenty-one".