524720221 has 2 divisors, whose sum is σ = 524720222. Its totient is φ = 524720220.

The previous prime is 524720123. The next prime is 524720257. The reversal of 524720221 is 122027425.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 488852100 + 35868121 = 22110^2 + 5989^2 .

It is a cyclic number.

It is not a de Polignac number, because 524720221 - 2¹³ = 524712029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (524720281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262360110 + 262360111.

It is an arithmetic number, because the mean of its divisors is an integer number (262360111).

Almost surely, 2^524720221 is an apocalyptic number.

It is an amenable number.

524720221 is a deficient number, since it is larger than the sum of its proper divisors (1).

524720221 is an equidigital number, since it uses as much as digits as its factorization.

524720221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 524720221 is about 22906.7723828566. The cubic root of 524720221 is about 806.5709948653.

Adding to 524720221 its reverse (122027425), we get a palindrome (646747646).

The spelling of 524720221 in words is "five hundred twenty-four million, seven hundred twenty thousand, two hundred twenty-one".