1968091 has 4 divisors (see below), whose sum is σ = 1976184. Its totient is φ = 1960000.

The previous prime is 1968079. The next prime is 1968103. The reversal of 1968091 is 1908691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1908691 = 1237 ⋅1543.

It is an interprime number because it is at equal distance from previous prime (1968079) and next prime (1968103).

It is a cyclic number.

It is not a de Polignac number, because 1968091 - 2⁵ = 1968059 is a prime.

It is a Duffinian number.

1968091 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1968061) 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 in 3 ways as a sum of consecutive naturals, for example, 3670 + ... + 4171.

It is an arithmetic number, because the mean of its divisors is an integer number (494046).

2^1968091 is an apocalyptic number.

1968091 is a deficient number, since it is larger than the sum of its proper divisors (8093).

1968091 is an equidigital number, since it uses as much as digits as its factorization.

1968091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8092.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1968091 is about 1402.8866668409. The cubic root of 1968091 is about 125.3184626301.

The spelling of 1968091 in words is "one million, nine hundred sixty-eight thousand, ninety-one".