801877891 has 2 divisors, whose sum is σ = 801877892. Its totient is φ = 801877890.

The previous prime is 801877871. The next prime is 801877897. The reversal of 801877891 is 198778108.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 801877891 - 2²³ = 793489283 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (801877897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 400938945 + 400938946.

It is an arithmetic number, because the mean of its divisors is an integer number (400938946).

Almost surely, 2^801877891 is an apocalyptic number.

801877891 is a deficient number, since it is larger than the sum of its proper divisors (1).

801877891 is an equidigital number, since it uses as much as digits as its factorization.

801877891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 49.

The square root of 801877891 is about 28317.4485255999. The cubic root of 801877891 is about 929.0435656051.

The spelling of 801877891 in words is "eight hundred one million, eight hundred seventy-seven thousand, eight hundred ninety-one".