811043257 has 2 divisors, whose sum is σ = 811043258. Its totient is φ = 811043256.

The previous prime is 811043249. The next prime is 811043333. The reversal of 811043257 is 752340118.

811043257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 667498896 + 143544361 = 25836^2 + 11981^2 .

It is a cyclic number.

It is not a de Polignac number, because 811043257 - 2³ = 811043249 is a prime.

It is equal to p_41685151 and since 811043257 and 41685151 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (811043357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405521628 + 405521629.

It is an arithmetic number, because the mean of its divisors is an integer number (405521629).

Almost surely, 2^811043257 is an apocalyptic number.

It is an amenable number.

811043257 is a deficient number, since it is larger than the sum of its proper divisors (1).

811043257 is an equidigital number, since it uses as much as digits as its factorization.

811043257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 811043257 is about 28478.8212010259. The cubic root of 811043257 is about 932.5697828162.

The spelling of 811043257 in words is "eight hundred eleven million, forty-three thousand, two hundred fifty-seven".