801321811 has 2 divisors, whose sum is σ = 801321812. Its totient is φ = 801321810.

The previous prime is 801321791. The next prime is 801321853. The reversal of 801321811 is 118123108.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 801321811 - 2⁷ = 801321683 is a prime.

It is not a weakly prime, because it can be changed into another prime (801322811) 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, 400660905 + 400660906.

It is an arithmetic number, because the mean of its divisors is an integer number (400660906).

Almost surely, 2^801321811 is an apocalyptic number.

801321811 is a deficient number, since it is larger than the sum of its proper divisors (1).

801321811 is an equidigital number, since it uses as much as digits as its factorization.

801321811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 25.

The square root of 801321811 is about 28307.6281415452. The cubic root of 801321811 is about 928.8287606584.

Adding to 801321811 its reverse (118123108), we get a palindrome (919444919).

The spelling of 801321811 in words is "eight hundred one million, three hundred twenty-one thousand, eight hundred eleven".