517221253 has 2 divisors, whose sum is σ = 517221254. Its totient is φ = 517221252.

The previous prime is 517221247. The next prime is 517221269. The reversal of 517221253 is 352122715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396726724 + 120494529 = 19918^2 + 10977^2 .

It is a cyclic number.

It is not a de Polignac number, because 517221253 - 2¹⁷ = 517090181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (517221203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 258610626 + 258610627.

It is an arithmetic number, because the mean of its divisors is an integer number (258610627).

Almost surely, 2^517221253 is an apocalyptic number.

It is an amenable number.

517221253 is a deficient number, since it is larger than the sum of its proper divisors (1).

517221253 is an equidigital number, since it uses as much as digits as its factorization.

517221253 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 28.

The square root of 517221253 is about 22742.4988292843. The cubic root of 517221253 is about 802.7102106834.

Adding to 517221253 its reverse (352122715), we get a palindrome (869343968).

It can be divided in two parts, 51722 and 1253, that added together give a triangular number (52975 = T₃₂₅).

The spelling of 517221253 in words is "five hundred seventeen million, two hundred twenty-one thousand, two hundred fifty-three".