1090891 has 2 divisors, whose sum is σ = 1090892. Its totient is φ = 1090890.

The previous prime is 1090889. The next prime is 1090897. The reversal of 1090891 is 1980901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1090891 - 2¹ = 1090889 is a prime.

Together with 1090889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1090897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545445 + 545446.

It is an arithmetic number, because the mean of its divisors is an integer number (545446).

2^1090891 is an apocalyptic number.

1090891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1090891 is an equidigital number, since it uses as much as digits as its factorization.

1090891 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 28.

The square root of 1090891 is about 1044.4572753349. The cubic root of 1090891 is about 102.9422807917.

The spelling of 1090891 in words is "one million, ninety thousand, eight hundred ninety-one".