81081255 has 32 divisors (see below), whose sum is σ = 133954560. Its totient is φ = 41857920.

The previous prime is 81081241. The next prime is 81081257. The reversal of 81081255 is 55218018.

It is not a de Polignac number, because 81081255 - 2⁶ = 81081191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81081257) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 62160 + ... + 63450.

It is an arithmetic number, because the mean of its divisors is an integer number (4186080).

Almost surely, 2^81081255 is an apocalyptic number.

81081255 is a deficient number, since it is larger than the sum of its proper divisors (52873305).

81081255 is a wasteful number, since it uses less digits than its factorization.

81081255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431.

The product of its (nonzero) digits is 3200, while the sum is 30.

The square root of 81081255 is about 9004.5130351397. The cubic root of 81081255 is about 432.8195017396.

The spelling of 81081255 in words is "eighty-one million, eighty-one thousand, two hundred fifty-five".