81041711 has 2 divisors, whose sum is σ = 81041712. Its totient is φ = 81041710.

The previous prime is 81041671. The next prime is 81041759. The reversal of 81041711 is 11714018.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81041711 - 2¹⁴ = 81025327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81041911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40520855 + 40520856.

It is an arithmetic number, because the mean of its divisors is an integer number (40520856).

Almost surely, 2^81041711 is an apocalyptic number.

81041711 is a deficient number, since it is larger than the sum of its proper divisors (1).

81041711 is an equidigital number, since it uses as much as digits as its factorization.

81041711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 23.

The square root of 81041711 is about 9002.3169795337. The cubic root of 81041711 is about 432.7491270783.

Adding to 81041711 its reverse (11714018), we get a palindrome (92755729).

The spelling of 81041711 in words is "eighty-one million, forty-one thousand, seven hundred eleven".