811893241 has 2 divisors, whose sum is σ = 811893242. Its totient is φ = 811893240.

The previous prime is 811893239. The next prime is 811893263. The reversal of 811893241 is 142398118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 620209216 + 191684025 = 24904^2 + 13845^2 .

It is a cyclic number.

It is not a de Polignac number, because 811893241 - 2¹ = 811893239 is a prime.

Together with 811893239, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 811893241.

It is not a weakly prime, because it can be changed into another prime (811893211) 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, 405946620 + 405946621.

It is an arithmetic number, because the mean of its divisors is an integer number (405946621).

Almost surely, 2^811893241 is an apocalyptic number.

It is an amenable number.

811893241 is a deficient number, since it is larger than the sum of its proper divisors (1).

811893241 is an equidigital number, since it uses as much as digits as its factorization.

811893241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 37.

The square root of 811893241 is about 28493.7403827578. The cubic root of 811893241 is about 932.8954508736.

The spelling of 811893241 in words is "eight hundred eleven million, eight hundred ninety-three thousand, two hundred forty-one".