1995391 has 2 divisors, whose sum is σ = 1995392. Its totient is φ = 1995390.

The previous prime is 1995359. The next prime is 1995421. The reversal of 1995391 is 1935991.

It is a strong prime.

It is an emirp because it is prime and its reverse (1935991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1995391 - 2⁵ = 1995359 is a prime.

It is a Chen prime.

1995391 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1995391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1995311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997695 + 997696.

It is an arithmetic number, because the mean of its divisors is an integer number (997696).

2^1995391 is an apocalyptic number.

1995391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1995391 is an equidigital number, since it uses as much as digits as its factorization.

1995391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10935, while the sum is 37.

The square root of 1995391 is about 1412.5830949010. The cubic root of 1995391 is about 125.8952476134.

The spelling of 1995391 in words is "one million, nine hundred ninety-five thousand, three hundred ninety-one".