808891451917 has 2 divisors, whose sum is σ = 808891451918. Its totient is φ = 808891451916.

The previous prime is 808891451831. The next prime is 808891451969. The reversal of 808891451917 is 719154198808.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 805001933961 + 3889517956 = 897219^2 + 62366^2 .

It is a cyclic number.

It is not a de Polignac number, because 808891451917 - 2³¹ = 806743968269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (808891491917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404445725958 + 404445725959.

It is an arithmetic number, because the mean of its divisors is an integer number (404445725959).

Almost surely, 2^808891451917 is an apocalyptic number.

It is an amenable number.

808891451917 is a deficient number, since it is larger than the sum of its proper divisors (1).

808891451917 is an equidigital number, since it uses as much as digits as its factorization.

808891451917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5806080, while the sum is 61.

The spelling of 808891451917 in words is "eight hundred eight billion, eight hundred ninety-one million, four hundred fifty-one thousand, nine hundred seventeen".