945009081 has 9 divisors (see below), whose sum is σ = 1365146341. Its totient is φ = 629944572.

The previous prime is 945009067. The next prime is 945009083. The reversal of 945009081 is 180900549.

The square root of 945009081 is 30741.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 945009081 - 2⁹ = 945008569 is a prime.

It is a super-2 number, since 2×945009081² = 1786084326344929122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (945009083) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 87100 + ... + 97346.

Almost surely, 2^945009081 is an apocalyptic number.

945009081 is the 30741-st square number.

945009081 is the 15371-st centered octagonal number.

It is an amenable number.

945009081 is a deficient number, since it is larger than the sum of its proper divisors (420137260).

945009081 is an frugal number, since it uses more digits than its factorization.

945009081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20500 (or 10250 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The cubic root of 945009081 is about 981.3230363855.

Multiplying 945009081 by its sum of digits (36), we get a square (34020326916 = 184446²).

The spelling of 945009081 in words is "nine hundred forty-five million, nine thousand, eighty-one".