543525221 has 4 divisors (see below), whose sum is σ = 562267500. Its totient is φ = 524782944.

The previous prime is 543525217. The next prime is 543525247. The reversal of 543525221 is 122525345.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122525345 = 5 ⋅24505069.

It can be written as a sum of positive squares in 2 ways, for example, as 276856321 + 266668900 = 16639^2 + 16330^2 .

It is a cyclic number.

It is not a de Polignac number, because 543525221 - 2² = 543525217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 18742249 = 543525221 / (5 + 4 + 3 + 5 + 2 + 5 + 2 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (543525211) 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, 9371096 + ... + 9371153.

It is an arithmetic number, because the mean of its divisors is an integer number (140566875).

Almost surely, 2^543525221 is an apocalyptic number.

It is an amenable number.

543525221 is a deficient number, since it is larger than the sum of its proper divisors (18742279).

543525221 is a wasteful number, since it uses less digits than its factorization.

543525221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18742278.

The product of its digits is 12000, while the sum is 29.

The square root of 543525221 is about 23313.6273668428. The cubic root of 543525221 is about 816.0934654610.

The spelling of 543525221 in words is "five hundred forty-three million, five hundred twenty-five thousand, two hundred twenty-one".