900111001 has 4 divisors (see below), whose sum is σ = 900445492. Its totient is φ = 899776512.

The previous prime is 900110999. The next prime is 900111011. The reversal of 900111001 is 100111009.

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 896942601 + 3168400 = 29949^2 + 1780^2 .

It is a cyclic number.

It is not a de Polignac number, because 900111001 - 2¹ = 900110999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (900111011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163176 + ... + 168601.

It is an arithmetic number, because the mean of its divisors is an integer number (225111373).

Almost surely, 2^900111001 is an apocalyptic number.

It is an amenable number.

900111001 is a deficient number, since it is larger than the sum of its proper divisors (334491).

900111001 is a wasteful number, since it uses less digits than its factorization.

900111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334490.

The product of its (nonzero) digits is 9, while the sum is 13.

The square root of 900111001 is about 30001.8499596275. The cubic root of 900111001 is about 965.5290756729.

It can be divided in two parts, 9001 and 11001, that added together give a palindrome (20002).

The spelling of 900111001 in words is "nine hundred million, one hundred eleven thousand, one".