1995691 has 2 divisors, whose sum is σ = 1995692. Its totient is φ = 1995690.

The previous prime is 1995689. The next prime is 1995709. The reversal of 1995691 is 1965991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1995691 - 2¹ = 1995689 is a prime.

Together with 1995689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1995611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997845 + 997846.

It is an arithmetic number, because the mean of its divisors is an integer number (997846).

2^1995691 is an apocalyptic number.

1995691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1995691 is an equidigital number, since it uses as much as digits as its factorization.

1995691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21870, while the sum is 40.

The square root of 1995691 is about 1412.6892793534. The cubic root of 1995691 is about 125.9015565994.

The spelling of 1995691 in words is "one million, nine hundred ninety-five thousand, six hundred ninety-one".