81523041 has 16 divisors (see below), whose sum is σ = 115481664. Its totient is φ = 50978304.

The previous prime is 81523037. The next prime is 81523067. The reversal of 81523041 is 14032518.

It is not a de Polignac number, because 81523041 - 2² = 81523037 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81523241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13410 + ... + 18516.

It is an arithmetic number, because the mean of its divisors is an integer number (7217604).

Almost surely, 2^81523041 is an apocalyptic number.

It is an amenable number.

81523041 is a deficient number, since it is larger than the sum of its proper divisors (33958623).

81523041 is a wasteful number, since it uses less digits than its factorization.

81523041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5440.

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 81523041 is about 9029.0110754168. The cubic root of 81523041 is about 433.6041769664.

Adding to 81523041 its reverse (14032518), we get a palindrome (95555559).

The spelling of 81523041 in words is "eighty-one million, five hundred twenty-three thousand, forty-one".