420412561 has 4 divisors (see below), whose sum is σ = 438691392. Its totient is φ = 402133732.

The previous prime is 420412529. The next prime is 420412579. The reversal of 420412561 is 165214024.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 420412561 - 2⁵ = 420412529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420412511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9139381 + ... + 9139426.

It is an arithmetic number, because the mean of its divisors is an integer number (109672848).

Almost surely, 2^420412561 is an apocalyptic number.

It is an amenable number.

420412561 is a deficient number, since it is larger than the sum of its proper divisors (18278831).

420412561 is a wasteful number, since it uses less digits than its factorization.

420412561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18278830.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 420412561 is about 20503.9645190875. The cubic root of 420412561 is about 749.1323661505.

Adding to 420412561 its reverse (165214024), we get a palindrome (585626585).

The spelling of 420412561 in words is "four hundred twenty million, four hundred twelve thousand, five hundred sixty-one".