808267921 has 2 divisors, whose sum is σ = 808267922. Its totient is φ = 808267920.

The previous prime is 808267853. The next prime is 808267931. The reversal of 808267921 is 129762808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 807980625 + 287296 = 28425^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 808267921 - 2⁷ = 808267793 is a prime.

It is not a weakly prime, because it can be changed into another prime (808267931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404133960 + 404133961.

It is an arithmetic number, because the mean of its divisors is an integer number (404133961).

Almost surely, 2^808267921 is an apocalyptic number.

It is an amenable number.

808267921 is a deficient number, since it is larger than the sum of its proper divisors (1).

808267921 is an equidigital number, since it uses as much as digits as its factorization.

808267921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 808267921 is about 28430.0531304463. The cubic root of 808267921 is about 931.5048366072.

The spelling of 808267921 in words is "eight hundred eight million, two hundred sixty-seven thousand, nine hundred twenty-one".