52290721 has 4 divisors (see below), whose sum is σ = 59760832. Its totient is φ = 44820612.

The previous prime is 52290677. The next prime is 52290737. The reversal of 52290721 is 12709225.

52290721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 52290721 - 2¹¹ = 52288673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 52290721.

It is not an unprimeable number, because it can be changed into a prime (52290751) 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 3 ways as a sum of consecutive naturals, for example, 3735045 + ... + 3735058.

It is an arithmetic number, because the mean of its divisors is an integer number (14940208).

Almost surely, 2^52290721 is an apocalyptic number.

It is an amenable number.

52290721 is a deficient number, since it is larger than the sum of its proper divisors (7470111).

52290721 is an equidigital number, since it uses as much as digits as its factorization.

52290721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7470110.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 52290721 is about 7231.2323292783. The cubic root of 52290721 is about 373.9454127390.

Adding to 52290721 its reverse (12709225), we get a palindrome (64999946).

The spelling of 52290721 in words is "fifty-two million, two hundred ninety thousand, seven hundred twenty-one".