426800821 has 2 divisors, whose sum is σ = 426800822. Its totient is φ = 426800820.

The previous prime is 426800813. The next prime is 426800831. The reversal of 426800821 is 128008624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 423948100 + 2852721 = 20590^2 + 1689^2 .

It is a cyclic number.

It is not a de Polignac number, because 426800821 - 2³ = 426800813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (426800831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213400410 + 213400411.

It is an arithmetic number, because the mean of its divisors is an integer number (213400411).

Almost surely, 2^426800821 is an apocalyptic number.

It is an amenable number.

426800821 is a deficient number, since it is larger than the sum of its proper divisors (1).

426800821 is an equidigital number, since it uses as much as digits as its factorization.

426800821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 426800821 is about 20659.1582839185. The cubic root of 426800821 is about 752.9077173748.

The spelling of 426800821 in words is "four hundred twenty-six million, eight hundred thousand, eight hundred twenty-one".