520221253 has 2 divisors, whose sum is σ = 520221254. Its totient is φ = 520221252.

The previous prime is 520221217. The next prime is 520221263. The reversal of 520221253 is 352122025.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 293025924 + 227195329 = 17118^2 + 15073^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520221253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (520221203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260110626 + 260110627.

It is an arithmetic number, because the mean of its divisors is an integer number (260110627).

Almost surely, 2^520221253 is an apocalyptic number.

It is an amenable number.

520221253 is a deficient number, since it is larger than the sum of its proper divisors (1).

520221253 is an equidigital number, since it uses as much as digits as its factorization.

520221253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 520221253 is about 22808.3592790012. The cubic root of 520221253 is about 804.2591865249.

Adding to 520221253 its reverse (352122025), we get a palindrome (872343278).

The spelling of 520221253 in words is "five hundred twenty million, two hundred twenty-one thousand, two hundred fifty-three".