909001 has 4 divisors (see below), whose sum is σ = 911812. Its totient is φ = 906192.

The previous prime is 908993. The next prime is 909019. The reversal of 909001 is 100909.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 705600 + 203401 = 840^2 + 451^2 .

It is a cyclic number.

It is not a de Polignac number, because 909001 - 2³ = 908993 is a prime.

It is a Duffinian number.

909001 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 909001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (909031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 846 + ... + 1591.

It is an arithmetic number, because the mean of its divisors is an integer number (227953).

2⁹⁰⁹⁰⁰¹ is an apocalyptic number.

It is an amenable number.

909001 is a deficient number, since it is larger than the sum of its proper divisors (2811).

909001 is a wasteful number, since it uses less digits than its factorization.

909001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810.

The product of its (nonzero) digits is 81, while the sum is 19.

The square root of 909001 is about 953.4154393547. The cubic root of 909001 is about 96.8697369322.

The spelling of 909001 in words is "nine hundred nine thousand, one".