81055155 has 16 divisors (see below), whose sum is σ = 132852384. Its totient is φ = 42174720.

The previous prime is 81055141. The next prime is 81055199. The reversal of 81055155 is 55155018.

It is not a de Polignac number, because 81055155 - 2⁸ = 81054899 is a prime.

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, 65284 + ... + 66513.

It is an arithmetic number, because the mean of its divisors is an integer number (8303274).

Almost surely, 2^81055155 is an apocalyptic number.

81055155 is a deficient number, since it is larger than the sum of its proper divisors (51797229).

81055155 is a wasteful number, since it uses less digits than its factorization.

81055155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131846.

The product of its (nonzero) digits is 5000, while the sum is 30.

The square root of 81055155 is about 9003.0636452266. The cubic root of 81055155 is about 432.7730553226.

The spelling of 81055155 in words is "eighty-one million, fifty-five thousand, one hundred fifty-five".