811145641 has 2 divisors, whose sum is σ = 811145642. Its totient is φ = 811145640.

The previous prime is 811145591. The next prime is 811145737. The reversal of 811145641 is 146541118.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 461605225 + 349540416 = 21485^2 + 18696^2 .

It is a cyclic number.

It is not a de Polignac number, because 811145641 - 2⁷ = 811145513 is a prime.

It is equal to p_41690128 and since 811145641 and 41690128 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 (811145941) 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, 405572820 + 405572821.

It is an arithmetic number, because the mean of its divisors is an integer number (405572821).

Almost surely, 2^811145641 is an apocalyptic number.

It is an amenable number.

811145641 is a deficient number, since it is larger than the sum of its proper divisors (1).

811145641 is an equidigital number, since it uses as much as digits as its factorization.

811145641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 31.

The square root of 811145641 is about 28480.6186906113. The cubic root of 811145641 is about 932.6090228963.

Adding to 811145641 its reverse (146541118), we get a palindrome (957686759).

The spelling of 811145641 in words is "eight hundred eleven million, one hundred forty-five thousand, six hundred forty-one".