1000091 has 4 divisors (see below), whose sum is σ = 1032384. Its totient is φ = 967800.

The previous prime is 1000081. The next prime is 1000099. The reversal of 1000091 is 1900001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1900001 = 257 ⋅7393.

It is a cyclic number.

It is not a de Polignac number, because 1000091 - 2¹⁰ = 999067 is a prime.

It is a Duffinian number.

1000091 is a modest number, since divided by 91 gives 1 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1000099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16100 + ... + 16161.

It is an arithmetic number, because the mean of its divisors is an integer number (258096).

2^1000091 is an apocalyptic number.

1000091 is a deficient number, since it is larger than the sum of its proper divisors (32293).

1000091 is an equidigital number, since it uses as much as digits as its factorization.

1000091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32292.

The product of its (nonzero) digits is 9, while the sum is 11.

The square root of 1000091 is about 1000.0454989649. The cubic root of 1000091 is about 100.0030332413.

Adding to 1000091 its reverse (1900001), we get a palindrome (2900092).

The spelling of 1000091 in words is "one million, ninety-one", and thus it is an aban number and an uban number.