81055365 has 16 divisors (see below), whose sum is σ = 130638528. Its totient is φ = 42912896.

The previous prime is 81055363. The next prime is 81055367. The reversal of 81055365 is 56355018.

It is an interprime number because it is at equal distance from previous prime (81055363) and next prime (81055367).

It is a cyclic number.

It is not a de Polignac number, because 81055365 - 2¹ = 81055363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81055361) 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 in 15 ways as a sum of consecutive naturals, for example, 17667 + ... + 21776.

It is an arithmetic number, because the mean of its divisors is an integer number (8164908).

Almost surely, 2^81055365 is an apocalyptic number.

It is an amenable number.

81055365 is a deficient number, since it is larger than the sum of its proper divisors (49583163).

81055365 is a wasteful number, since it uses less digits than its factorization.

81055365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39588.

The product of its (nonzero) digits is 18000, while the sum is 33.

The square root of 81055365 is about 9003.0753079156. The cubic root of 81055365 is about 432.7734290692.

The spelling of 81055365 in words is "eighty-one million, fifty-five thousand, three hundred sixty-five".