420544001 has 4 divisors (see below), whose sum is σ = 421502400. Its totient is φ = 419585604.

The previous prime is 420543997. The next prime is 420544009. The reversal of 420544001 is 100445024.

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 420544001 - 2² = 420543997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420544009) 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, 478541 + ... + 479418.

It is an arithmetic number, because the mean of its divisors is an integer number (105375600).

Almost surely, 2^420544001 is an apocalyptic number.

It is an amenable number.

420544001 is a deficient number, since it is larger than the sum of its proper divisors (958399).

420544001 is an equidigital number, since it uses as much as digits as its factorization.

420544001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 958398.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 420544001 is about 20507.1695023960. The cubic root of 420544001 is about 749.2104289135.

Adding to 420544001 its reverse (100445024), we get a palindrome (520989025).

The spelling of 420544001 in words is "four hundred twenty million, five hundred forty-four thousand, one".