81459500 has 48 divisors (see below), whose sum is σ = 179026848. Its totient is φ = 32379200.

The previous prime is 81459493. The next prime is 81459503. The reversal of 81459500 is 595418.

81459500 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

81459500 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (81459503) 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, 98087 + ... + 98913.

It is an arithmetic number, because the mean of its divisors is an integer number (3729726).

Almost surely, 2^81459500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81459500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89513424).

81459500 is an abundant number, since it is smaller than the sum of its proper divisors (97567348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81459500 is a wasteful number, since it uses less digits than its factorization.

81459500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1043 (or 1031 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 32.

The square root of 81459500 is about 9025.4916763576. The cubic root of 81459500 is about 433.4914938774.

The spelling of 81459500 in words is "eighty-one million, four hundred fifty-nine thousand, five hundred".