890091 has 6 divisors (see below), whose sum is σ = 1285700. Its totient is φ = 593388.

The previous prime is 890083. The next prime is 890107. The reversal of 890091 is 190098.

It is not a de Polignac number, because 890091 - 2³ = 890083 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (890011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 49441 + ... + 49458.

2⁸⁹⁰⁰⁹¹ is an apocalyptic number.

890091 is a deficient number, since it is larger than the sum of its proper divisors (395609).

890091 is a wasteful number, since it uses less digits than its factorization.

890091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98905 (or 98902 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 890091 is about 943.4463418764. The cubic root of 890091 is about 96.1932954354.

The spelling of 890091 in words is "eight hundred ninety thousand, ninety-one".