521225503 has 2 divisors, whose sum is σ = 521225504. Its totient is φ = 521225502.

The previous prime is 521225483. The next prime is 521225513. The reversal of 521225503 is 305522125.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 521225503 - 2²⁵ = 487671071 is a prime.

It is equal to p_27413530 and since 521225503 and 27413530 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521225513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260612751 + 260612752.

It is an arithmetic number, because the mean of its divisors is an integer number (260612752).

Almost surely, 2^521225503 is an apocalyptic number.

521225503 is a deficient number, since it is larger than the sum of its proper divisors (1).

521225503 is an equidigital number, since it uses as much as digits as its factorization.

521225503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 521225503 is about 22830.3636195309. The cubic root of 521225503 is about 804.7763755216.

Adding to 521225503 its reverse (305522125), we get a palindrome (826747628).

The spelling of 521225503 in words is "five hundred twenty-one million, two hundred twenty-five thousand, five hundred three".