900091000 has 32 divisors (see below), whose sum is σ = 2106215280. Its totient is φ = 360036000.

The previous prime is 900090979. The next prime is 900091001. The reversal of 900091000 is 190009.

900091000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900091001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 449046 + ... + 451045.

Almost surely, 2^900091000 is an apocalyptic number.

It is an amenable number.

900091000 is an abundant number, since it is smaller than the sum of its proper divisors (1206124280).

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

900091000 is a wasteful number, since it uses less digits than its factorization.

900091000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900112 (or 900098 counting only the distinct ones).

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

The square root of 900091000 is about 30001.5166283306. The cubic root of 900091000 is about 965.5219240771.

It can be divided in two parts, 9000 and 91000, that added together give a 5-th power (100000 = 10⁵).

The spelling of 900091000 in words is "nine hundred million, ninety-one thousand".