52721281 has 4 divisors (see below), whose sum is σ = 52781872. Its totient is φ = 52660692.

The previous prime is 52721113. The next prime is 52721287. The reversal of 52721281 is 18212725.

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 52721281 - 2¹⁵ = 52688513 is a prime.

It is a super-2 number, since 2×52721281² = 5559066940561922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52721287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28971 + ... + 30736.

It is an arithmetic number, because the mean of its divisors is an integer number (13195468).

Almost surely, 2^52721281 is an apocalyptic number.

It is an amenable number.

52721281 is a deficient number, since it is larger than the sum of its proper divisors (60591).

52721281 is an equidigital number, since it uses as much as digits as its factorization.

52721281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60590.

The product of its digits is 2240, while the sum is 28.

The square root of 52721281 is about 7260.9421564973. The cubic root of 52721281 is about 374.9689598011.

The spelling of 52721281 in words is "fifty-two million, seven hundred twenty-one thousand, two hundred eighty-one".