1963391 has 2 divisors, whose sum is σ = 1963392. Its totient is φ = 1963390.

The previous prime is 1963369. The next prime is 1963397. The reversal of 1963391 is 1933691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1963391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1963397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 981695 + 981696.

It is an arithmetic number, because the mean of its divisors is an integer number (981696).

2^1963391 is an apocalyptic number.

1963391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1963391 is an equidigital number, since it uses as much as digits as its factorization.

1963391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4374, while the sum is 32.

The square root of 1963391 is about 1401.2105480619. The cubic root of 1963391 is about 125.2186254005.

The spelling of 1963391 in words is "one million, nine hundred sixty-three thousand, three hundred ninety-one".