53182721 has 4 divisors (see below), whose sum is σ = 53856000. Its totient is φ = 52509444.

The previous prime is 53182697. The next prime is 53182733. The reversal of 53182721 is 12728135.

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 53182721 - 2¹⁸ = 52920577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53182741) 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, 336521 + ... + 336678.

It is an arithmetic number, because the mean of its divisors is an integer number (13464000).

Almost surely, 2^53182721 is an apocalyptic number.

It is an amenable number.

53182721 is a deficient number, since it is larger than the sum of its proper divisors (673279).

53182721 is an equidigital number, since it uses as much as digits as its factorization.

53182721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673278.

The product of its digits is 3360, while the sum is 29.

The square root of 53182721 is about 7292.6484215270. The cubic root of 53182721 is about 376.0597484084.

The spelling of 53182721 in words is "fifty-three million, one hundred eighty-two thousand, seven hundred twenty-one".