81455289 has 8 divisors (see below), whose sum is σ = 109326912. Its totient is φ = 53943600.

The previous prime is 81455281. The next prime is 81455293. The reversal of 81455289 is 98255418.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81455289 - 2³ = 81455281 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81455289.

It is not an unprimeable number, because it can be changed into a prime (81455281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89454 + ... + 90359.

It is an arithmetic number, because the mean of its divisors is an integer number (13665864).

Almost surely, 2^81455289 is an apocalyptic number.

It is an amenable number.

81455289 is a deficient number, since it is larger than the sum of its proper divisors (27871623).

81455289 is a wasteful number, since it uses less digits than its factorization.

81455289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179967.

The product of its digits is 115200, while the sum is 42.

The square root of 81455289 is about 9025.2583896529. The cubic root of 81455289 is about 433.4840240544.

The spelling of 81455289 in words is "eighty-one million, four hundred fifty-five thousand, two hundred eighty-nine".