420702561 has 12 divisors (see below), whose sum is σ = 610564240. Its totient is φ = 279137880.

The previous prime is 420702551. The next prime is 420702563. The reversal of 420702561 is 165207024.

It is not a de Polignac number, because 420702561 - 2⁹ = 420702049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420702563) 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 in 11 ways as a sum of consecutive naturals, for example, 108871 + ... + 112668.

Almost surely, 2^420702561 is an apocalyptic number.

It is an amenable number.

420702561 is a deficient number, since it is larger than the sum of its proper divisors (189861679).

420702561 is a wasteful number, since it uses less digits than its factorization.

420702561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221756 (or 221753 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 420702561 is about 20511.0351030854. The cubic root of 420702561 is about 749.3045767146.

Adding to 420702561 its reverse (165207024), we get a palindrome (585909585).

The spelling of 420702561 in words is "four hundred twenty million, seven hundred two thousand, five hundred sixty-one".