899091 has 12 divisors (see below), whose sum is σ = 1306968. Its totient is φ = 595584.

The previous prime is 899069. The next prime is 899123. The reversal of 899091 is 190998.

899091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 899091 - 2¹⁰ = 898067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (899051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2371 + ... + 2723.

It is an arithmetic number, because the mean of its divisors is an integer number (108914).

2⁸⁹⁹⁰⁹¹ is an apocalyptic number.

899091 is a deficient number, since it is larger than the sum of its proper divisors (407877).

899091 is a wasteful number, since it uses less digits than its factorization.

899091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642 (or 639 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 899091 is about 948.2040919549. The cubic root of 899091 is about 96.5164227019.

It can be divided in two parts, 89 and 9091, that added together give a triangular number (9180 = T₁₃₅).

The spelling of 899091 in words is "eight hundred ninety-nine thousand, ninety-one".