81895055 has 16 divisors (see below), whose sum is σ = 108165024. Its totient is φ = 59028480.

The previous prime is 81895049. The next prime is 81895057. The reversal of 81895055 is 55059818.

It is not a de Polignac number, because 81895055 - 2¹⁰ = 81894031 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81895057) 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, 374 + ... + 12803.

It is an arithmetic number, because the mean of its divisors is an integer number (6760314).

Almost surely, 2^81895055 is an apocalyptic number.

81895055 is a deficient number, since it is larger than the sum of its proper divisors (26269969).

81895055 is a wasteful number, since it uses less digits than its factorization.

81895055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13306.

The product of its (nonzero) digits is 72000, while the sum is 41.

The square root of 81895055 is about 9049.5886646853. The cubic root of 81895055 is about 434.2627314017.

The spelling of 81895055 in words is "eighty-one million, eight hundred ninety-five thousand, fifty-five".