81552895 has 16 divisors (see below), whose sum is σ = 101479392. Its totient is φ = 62871040.

The previous prime is 81552853. The next prime is 81552929. The reversal of 81552895 is 59825518.

It is not a de Polignac number, because 81552895 - 2²¹ = 79455743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14619 + ... + 19411.

It is an arithmetic number, because the mean of its divisors is an integer number (6342462).

Almost surely, 2^81552895 is an apocalyptic number.

81552895 is a deficient number, since it is larger than the sum of its proper divisors (19926497).

81552895 is a wasteful number, since it uses less digits than its factorization.

81552895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4922.

The product of its digits is 144000, while the sum is 43.

The square root of 81552895 is about 9030.6641505484. The cubic root of 81552895 is about 433.6570995885.

The spelling of 81552895 in words is "eighty-one million, five hundred fifty-two thousand, eight hundred ninety-five".