800519891 has 2 divisors, whose sum is σ = 800519892. Its totient is φ = 800519890.

The previous prime is 800519879. The next prime is 800519917. The reversal of 800519891 is 198915008.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-800519891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (800519831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400259945 + 400259946.

It is an arithmetic number, because the mean of its divisors is an integer number (400259946).

Almost surely, 2^800519891 is an apocalyptic number.

800519891 is a deficient number, since it is larger than the sum of its proper divisors (1).

800519891 is an equidigital number, since it uses as much as digits as its factorization.

800519891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 41.

The square root of 800519891 is about 28293.4602160994. The cubic root of 800519891 is about 928.5188165322.

The spelling of 800519891 in words is "eight hundred million, five hundred nineteen thousand, eight hundred ninety-one".