900089 has 2 divisors, whose sum is σ = 900090. Its totient is φ = 900088.

The previous prime is 900061. The next prime is 900091. The reversal of 900089 is 980009.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 824464 + 75625 = 908^2 + 275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-900089 is a prime.

It is a Sophie Germain prime.

Together with 900091, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (900019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 450044 + 450045.

It is an arithmetic number, because the mean of its divisors is an integer number (450045).

2⁹⁰⁰⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

900089 is a deficient number, since it is larger than the sum of its proper divisors (1).

900089 is an equidigital number, since it uses as much as digits as its factorization.

900089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 900089 is about 948.7302040095. The cubic root of 900089 is about 96.5521208947.

The spelling of 900089 in words is "nine hundred thousand, eighty-nine".