421641601 has 2 divisors, whose sum is σ = 421641602. Its totient is φ = 421641600.

The previous prime is 421641593. The next prime is 421641607. The reversal of 421641601 is 106146124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404010000 + 17631601 = 20100^2 + 4199^2 .

It is a cyclic number.

It is not a de Polignac number, because 421641601 - 2³ = 421641593 is a prime.

It is not a weakly prime, because it can be changed into another prime (421641607) 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, 210820800 + 210820801.

It is an arithmetic number, because the mean of its divisors is an integer number (210820801).

Almost surely, 2^421641601 is an apocalyptic number.

It is an amenable number.

421641601 is a deficient number, since it is larger than the sum of its proper divisors (1).

421641601 is an equidigital number, since it uses as much as digits as its factorization.

421641601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 421641601 is about 20533.9134360696. The cubic root of 421641601 is about 749.8616639672.

Adding to 421641601 its reverse (106146124), we get a palindrome (527787725).

The spelling of 421641601 in words is "four hundred twenty-one million, six hundred forty-one thousand, six hundred one".