81534041 has 2 divisors, whose sum is σ = 81534042. Its totient is φ = 81534040.

The previous prime is 81534031. The next prime is 81534077. The reversal of 81534041 is 14043518.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63936016 + 17598025 = 7996^2 + 4195^2 .

It is a cyclic number.

It is not a de Polignac number, because 81534041 - 2¹⁰ = 81533017 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81534041.

It is not a weakly prime, because it can be changed into another prime (81534031) 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, 40767020 + 40767021.

It is an arithmetic number, because the mean of its divisors is an integer number (40767021).

Almost surely, 2^81534041 is an apocalyptic number.

It is an amenable number.

81534041 is a deficient number, since it is larger than the sum of its proper divisors (1).

81534041 is an equidigital number, since it uses as much as digits as its factorization.

81534041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 81534041 is about 9029.6202024227. The cubic root of 81534041 is about 433.6236783301.

Adding to 81534041 its reverse (14043518), we get a palindrome (95577559).

The spelling of 81534041 in words is "eighty-one million, five hundred thirty-four thousand, forty-one".