81041775 has 12 divisors (see below), whose sum is σ = 133989192. Its totient is φ = 43222240.

The previous prime is 81041773. The next prime is 81041777. The reversal of 81041775 is 57714018.

It is an interprime number because it is at equal distance from previous prime (81041773) and next prime (81041777).

It is not a de Polignac number, because 81041775 - 2¹ = 81041773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81041773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 540204 + ... + 540353.

It is an arithmetic number, because the mean of its divisors is an integer number (11165766).

Almost surely, 2^81041775 is an apocalyptic number.

81041775 is a deficient number, since it is larger than the sum of its proper divisors (52947417).

81041775 is a wasteful number, since it uses less digits than its factorization.

81041775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080570 (or 1080565 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 33.

The square root of 81041775 is about 9002.3205341734. The cubic root of 81041775 is about 432.7492409947.

The spelling of 81041775 in words is "eighty-one million, forty-one thousand, seven hundred seventy-five".