165090109 has 2 divisors, whose sum is σ = 165090110. Its totient is φ = 165090108.

The previous prime is 165090091. The next prime is 165090139. The reversal of 165090109 is 901090561.

Together with previous prime (165090091) 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., 164096100 + 994009 = 12810^2 + 997^2 .

It is a cyclic number.

It is not a de Polignac number, because 165090109 - 2¹¹ = 165088061 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165090139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82545054 + 82545055.

It is an arithmetic number, because the mean of its divisors is an integer number (82545055).

Almost surely, 2^165090109 is an apocalyptic number.

It is an amenable number.

165090109 is a deficient number, since it is larger than the sum of its proper divisors (1).

165090109 is an equidigital number, since it uses as much as digits as its factorization.

165090109 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 165090109 is about 12848.7395879907. The cubic root of 165090109 is about 548.5804816053.

The spelling of 165090109 in words is "one hundred sixty-five million, ninety thousand, one hundred nine".