521220463 has 2 divisors, whose sum is σ = 521220464. Its totient is φ = 521220462.

The previous prime is 521220461. The next prime is 521220481. The reversal of 521220463 is 364022125.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 521220463 - 2¹ = 521220461 is a prime.

Together with 521220461, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521220461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260610231 + 260610232.

It is an arithmetic number, because the mean of its divisors is an integer number (260610232).

Almost surely, 2^521220463 is an apocalyptic number.

521220463 is a deficient number, since it is larger than the sum of its proper divisors (1).

521220463 is an equidigital number, since it uses as much as digits as its factorization.

521220463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 521220463 is about 22830.2532399446. The cubic root of 521220463 is about 804.7737815797.

Adding to 521220463 its reverse (364022125), we get a palindrome (885242588).

The spelling of 521220463 in words is "five hundred twenty-one million, two hundred twenty thousand, four hundred sixty-three".