808223981 has 2 divisors, whose sum is σ = 808223982. Its totient is φ = 808223980.

The previous prime is 808223963. The next prime is 808223993. The reversal of 808223981 is 189322808.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 570015625 + 238208356 = 23875^2 + 15434^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-808223981 is a prime.

It is a super-2 number, since 2×808223981² = 1306452006926976722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (808223951) 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, 404111990 + 404111991.

It is an arithmetic number, because the mean of its divisors is an integer number (404111991).

Almost surely, 2^808223981 is an apocalyptic number.

It is an amenable number.

808223981 is a deficient number, since it is larger than the sum of its proper divisors (1).

808223981 is an equidigital number, since it uses as much as digits as its factorization.

808223981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 55296, while the sum is 41.

The square root of 808223981 is about 28429.2803461502. The cubic root of 808223981 is about 931.4879564518.

The spelling of 808223981 in words is "eight hundred eight million, two hundred twenty-three thousand, nine hundred eighty-one".