81059000 has 64 divisors (see below), whose sum is σ = 206949600. Its totient is φ = 29472000.

The previous prime is 81058993. The next prime is 81059003. The reversal of 81059000 is 95018.

It is a super-2 number, since 2×81059000² = 13141122962000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81059003) 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, 7316 + ... + 14684.

Almost surely, 2^81059000 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 81059000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103474800).

81059000 is an abundant number, since it is smaller than the sum of its proper divisors (125890600).

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

81059000 is a wasteful number, since it uses less digits than its factorization.

81059000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7401 (or 7387 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 81059000 is about 9003.2771811158. The cubic root of 81059000 is about 432.7798983424.

The spelling of 81059000 in words is "eighty-one million, fifty-nine thousand".