420816841 has 2 divisors, whose sum is σ = 420816842. Its totient is φ = 420816840.

The previous prime is 420816821. The next prime is 420816853. The reversal of 420816841 is 148618024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 329059600 + 91757241 = 18140^2 + 9579^2 .

It is a cyclic number.

It is not a de Polignac number, because 420816841 - 2⁹ = 420816329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420816797 and 420816806.

It is not a weakly prime, because it can be changed into another prime (420816821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210408420 + 210408421.

It is an arithmetic number, because the mean of its divisors is an integer number (210408421).

Almost surely, 2^420816841 is an apocalyptic number.

It is an amenable number.

420816841 is a deficient number, since it is larger than the sum of its proper divisors (1).

420816841 is an equidigital number, since it uses as much as digits as its factorization.

420816841 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12288, while the sum is 34.

The square root of 420816841 is about 20513.8207313996. The cubic root of 420816841 is about 749.3724178154.

The spelling of 420816841 in words is "four hundred twenty million, eight hundred sixteen thousand, eight hundred forty-one".