1965109 has 2 divisors, whose sum is σ = 1965110. Its totient is φ = 1965108.

The previous prime is 1965091. The next prime is 1965133. The reversal of 1965109 is 9015691.

Together with previous prime (1965091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1876900 + 88209 = 1370^2 + 297^2 .

It is an emirp because it is prime and its reverse (9015691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1965109 - 2⁵ = 1965077 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 (1965179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982554 + 982555.

It is an arithmetic number, because the mean of its divisors is an integer number (982555).

2^1965109 is an apocalyptic number.

It is an amenable number.

1965109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965109 is an equidigital number, since it uses as much as digits as its factorization.

1965109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 31.

The square root of 1965109 is about 1401.8234553609. The cubic root of 1965109 is about 125.2551375510.

It can be divided in two parts, 1965 and 109, that multiplied together give a triangular number (214185 = T₆₅₄).

The spelling of 1965109 in words is "one million, nine hundred sixty-five thousand, one hundred nine".