52258721 has 10 divisors (see below), whose sum is σ = 55299522. Its totient is φ = 49384800.

The previous prime is 52258673. The next prime is 52258733. The reversal of 52258721 is 12785225.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 52128400 + 130321 = 7220^2 + 361^2 .

It is not a de Polignac number, because 52258721 - 2¹⁰ = 52257697 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 (52258321) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 130121 + ... + 130521.

Almost surely, 2^52258721 is an apocalyptic number.

It is an amenable number.

52258721 is a deficient number, since it is larger than the sum of its proper divisors (3040801).

52258721 is an frugal number, since it uses more digits than its factorization.

52258721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 420 counting only the distinct ones).

The product of its digits is 11200, while the sum is 32.

The square root of 52258721 is about 7229.0193664148. The cubic root of 52258721 is about 373.8691168891.

The spelling of 52258721 in words is "fifty-two million, two hundred fifty-eight thousand, seven hundred twenty-one".