1968691 has 2 divisors, whose sum is σ = 1968692. Its totient is φ = 1968690.

The previous prime is 1968683. The next prime is 1968721.

1968691 is nontrivially palindromic in base 10.

It is a weak prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1968691 - 2³ = 1968683 is a prime.

1968691 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1968611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 984345 + 984346.

It is an arithmetic number, because the mean of its divisors is an integer number (984346).

2^1968691 is an apocalyptic number.

1968691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1968691 is an equidigital number, since it uses as much as digits as its factorization.

1968691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 40.

The square root of 1968691 is about 1403.1004953317. The cubic root of 1968691 is about 125.3311963634.

The spelling of 1968691 in words is "one million, nine hundred sixty-eight thousand, six hundred ninety-one".