52815281 has 8 divisors (see below), whose sum is σ = 53939784. Its totient is φ = 51701760.

The previous prime is 52815251. The next prime is 52815283. The reversal of 52815281 is 18251825.

52815281 = 378² + 379² + ... + 596².

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3591025 + 49224256 = 1895^2 + 7016^2 .

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 52815281 - 2¹⁴ = 52798897 is a prime.

It is a super-2 number, since 2×52815281² = 5578907814217922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (52815283) 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, 7361 + ... + 12641.

It is an arithmetic number, because the mean of its divisors is an integer number (6742473).

Almost surely, 2^52815281 is an apocalyptic number.

It is an amenable number.

52815281 is a deficient number, since it is larger than the sum of its proper divisors (1124503).

52815281 is a wasteful number, since it uses less digits than its factorization.

52815281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5491.

The product of its digits is 6400, while the sum is 32.

The square root of 52815281 is about 7267.4122629723. The cubic root of 52815281 is about 375.1916791927.

The spelling of 52815281 in words is "fifty-two million, eight hundred fifteen thousand, two hundred eighty-one".