53081921 has 8 divisors (see below), whose sum is σ = 54514824. Its totient is φ = 51655680.

The previous prime is 53081911. The next prime is 53081923. The reversal of 53081921 is 12918035.

It can be written as a sum of positive squares in 4 ways, for example, as 3534400 + 49547521 = 1880^2 + 7039^2 .

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 53081921 - 2¹⁸ = 52819777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53081923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17321 + ... + 20153.

It is an arithmetic number, because the mean of its divisors is an integer number (6814353).

Almost surely, 2^53081921 is an apocalyptic number.

It is an amenable number.

53081921 is a deficient number, since it is larger than the sum of its proper divisors (1432903).

53081921 is a wasteful number, since it uses less digits than its factorization.

53081921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3331.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 53081921 is about 7285.7340742028. The cubic root of 53081921 is about 375.8220095583.

Adding to 53081921 its reverse (12918035), we get a palindrome (65999956).

The spelling of 53081921 in words is "fifty-three million, eighty-one thousand, nine hundred twenty-one".