9001020081 has 32 divisors (see below), whose sum is σ = 13096028160. Its totient is φ = 5479379136.

The previous prime is 9001020079. The next prime is 9001020089. The reversal of 9001020081 is 1800201009.

It is not a de Polignac number, because 9001020081 - 2¹ = 9001020079 is a prime.

It is a super-3 number, since 3×9001020081³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (9001020089) 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, 205720 + ... + 245606.

It is an arithmetic number, because the mean of its divisors is an integer number (409250880).

Almost surely, 2^9001020081 is an apocalyptic number.

It is an amenable number.

9001020081 is a deficient number, since it is larger than the sum of its proper divisors (4095008079).

9001020081 is a wasteful number, since it uses less digits than its factorization.

9001020081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40053.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 9001020081 is about 94873.7059516492. The cubic root of 9001020081 is about 2080.1624072677.

The spelling of 9001020081 in words is "nine billion, one million, twenty thousand, eighty-one".