165253909 has 2 divisors, whose sum is σ = 165253910. Its totient is φ = 165253908.

The previous prime is 165253883. The next prime is 165253931. The reversal of 165253909 is 909352561.

It is a happy number.

165253909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161213809 + 4040100 = 12697^2 + 2010^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165253909 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 (165253939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82626954 + 82626955.

It is an arithmetic number, because the mean of its divisors is an integer number (82626955).

Almost surely, 2^165253909 is an apocalyptic number.

It is an amenable number.

165253909 is a deficient number, since it is larger than the sum of its proper divisors (1).

165253909 is an equidigital number, since it uses as much as digits as its factorization.

165253909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 165253909 is about 12855.1121737618. The cubic root of 165253909 is about 548.7618528200.

The spelling of 165253909 in words is "one hundred sixty-five million, two hundred fifty-three thousand, nine hundred nine".