1995109 has 2 divisors, whose sum is σ = 1995110. Its totient is φ = 1995108.

The previous prime is 1995107. The next prime is 1995121. The reversal of 1995109 is 9015991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1044484 + 950625 = 1022^2 + 975^2 .

It is an emirp because it is prime and its reverse (9015991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1995109 - 2¹ = 1995107 is a prime.

Together with 1995107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1995107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997554 + 997555.

It is an arithmetic number, because the mean of its divisors is an integer number (997555).

2^1995109 is an apocalyptic number.

It is an amenable number.

1995109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1995109 is an equidigital number, since it uses as much as digits as its factorization.

1995109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3645, while the sum is 34.

The square root of 1995109 is about 1412.4832742373. The cubic root of 1995109 is about 125.8893165900.

The spelling of 1995109 in words is "one million, nine hundred ninety-five thousand, one hundred nine".