81041911 has 2 divisors, whose sum is σ = 81041912. Its totient is φ = 81041910.

The previous prime is 81041893. The next prime is 81041963. The reversal of 81041911 is 11914018.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81041911 - 2¹⁷ = 80910839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81041981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40520955 + 40520956.

It is an arithmetic number, because the mean of its divisors is an integer number (40520956).

Almost surely, 2^81041911 is an apocalyptic number.

81041911 is a deficient number, since it is larger than the sum of its proper divisors (1).

81041911 is an equidigital number, since it uses as much as digits as its factorization.

81041911 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 81041911 is about 9002.3280877782. The cubic root of 81041911 is about 432.7494830668.

Adding to 81041911 its reverse (11914018), we get a palindrome (92955929).

The spelling of 81041911 in words is "eighty-one million, forty-one thousand, nine hundred eleven".