1090889 has 2 divisors, whose sum is σ = 1090890. Its totient is φ = 1090888.

The previous prime is 1090883. The next prime is 1090891. The reversal of 1090889 is 9880901.

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., 840889 + 250000 = 917^2 + 500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1090889 is a prime.

Together with 1090891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1090883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545444 + 545445.

It is an arithmetic number, because the mean of its divisors is an integer number (545445).

2^1090889 is an apocalyptic number.

It is an amenable number.

1090889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1090889 is an equidigital number, since it uses as much as digits as its factorization.

1090889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1090889 is about 1044.4563178994. The cubic root of 1090889 is about 102.9422178814.

The spelling of 1090889 in words is "one million, ninety thousand, eight hundred eighty-nine".