81017395 has 4 divisors (see below), whose sum is σ = 97220880. Its totient is φ = 64813912.

The previous prime is 81017381. The next prime is 81017449. The reversal of 81017395 is 59371018.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81017395 - 2¹⁵ = 80984627 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81017395.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 8101735 + ... + 8101744.

It is an arithmetic number, because the mean of its divisors is an integer number (24305220).

Almost surely, 2^81017395 is an apocalyptic number.

81017395 is a deficient number, since it is larger than the sum of its proper divisors (16203485).

81017395 is a wasteful number, since it uses less digits than its factorization.

81017395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16203484.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 81017395 is about 9000.9663370107. The cubic root of 81017395 is about 432.7058416300.

The spelling of 81017395 in words is "eighty-one million, seventeen thousand, three hundred ninety-five".