521220541 has 2 divisors, whose sum is σ = 521220542. Its totient is φ = 521220540.

The previous prime is 521220529. The next prime is 521220563. The reversal of 521220541 is 145022125.

It is an a-pointer prime, because the next prime (521220563) can be obtained adding 521220541 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 520798041 + 422500 = 22821^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 521220541 - 2¹¹ = 521218493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521220571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260610270 + 260610271.

It is an arithmetic number, because the mean of its divisors is an integer number (260610271).

Almost surely, 2^521220541 is an apocalyptic number.

It is an amenable number.

521220541 is a deficient number, since it is larger than the sum of its proper divisors (1).

521220541 is an equidigital number, since it uses as much as digits as its factorization.

521220541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 521220541 is about 22830.2549482041. The cubic root of 521220541 is about 804.7738217241.

Adding to 521220541 its reverse (145022125), we get a palindrome (666242666).

The spelling of 521220541 in words is "five hundred twenty-one million, two hundred twenty thousand, five hundred forty-one".