420513523 has 2 divisors, whose sum is σ = 420513524. Its totient is φ = 420513522.

The previous prime is 420513517. The next prime is 420513539. The reversal of 420513523 is 325315024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420513523 - 2⁹ = 420513011 is a prime.

It is not a weakly prime, because it can be changed into another prime (420513563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210256761 + 210256762.

It is an arithmetic number, because the mean of its divisors is an integer number (210256762).

Almost surely, 2^420513523 is an apocalyptic number.

420513523 is a deficient number, since it is larger than the sum of its proper divisors (1).

420513523 is an equidigital number, since it uses as much as digits as its factorization.

420513523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 420513523 is about 20506.4263829659. The cubic root of 420513523 is about 749.1923293512.

Adding to 420513523 its reverse (325315024), we get a palindrome (745828547).

The spelling of 420513523 in words is "four hundred twenty million, five hundred thirteen thousand, five hundred twenty-three".