1816091 has 2 divisors, whose sum is σ = 1816092. Its totient is φ = 1816090.

The previous prime is 1816069. The next prime is 1816099. The reversal of 1816091 is 1906181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1816091 - 2⁶ = 1816027 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1816091.

It is not a weakly prime, because it can be changed into another prime (1816099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 908045 + 908046.

It is an arithmetic number, because the mean of its divisors is an integer number (908046).

2^1816091 is an apocalyptic number.

1816091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1816091 is an equidigital number, since it uses as much as digits as its factorization.

1816091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1816091 is about 1347.6242057785. The cubic root of 1816091 is about 122.0054418427.

The spelling of 1816091 in words is "one million, eight hundred sixteen thousand, ninety-one".