420503609 has 2 divisors, whose sum is σ = 420503610. Its totient is φ = 420503608.

The previous prime is 420503539. The next prime is 420503621. The reversal of 420503609 is 906305024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 271590400 + 148913209 = 16480^2 + 12203^2 .

It is a cyclic number.

It is not a de Polignac number, because 420503609 - 2²⁰ = 419455033 is a prime.

It is not a weakly prime, because it can be changed into another prime (420503639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210251804 + 210251805.

It is an arithmetic number, because the mean of its divisors is an integer number (210251805).

Almost surely, 2^420503609 is an apocalyptic number.

It is an amenable number.

420503609 is a deficient number, since it is larger than the sum of its proper divisors (1).

420503609 is an equidigital number, since it uses as much as digits as its factorization.

420503609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 420503609 is about 20506.1846524408. The cubic root of 420503609 is about 749.1864416681.

The spelling of 420503609 in words is "four hundred twenty million, five hundred three thousand, six hundred nine".