165486913 has 2 divisors, whose sum is σ = 165486914. Its totient is φ = 165486912.

The previous prime is 165486911. The next prime is 165486931. The reversal of 165486913 is 319684561.

Together with next prime (165486931) 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., 159567424 + 5919489 = 12632^2 + 2433^2 .

It is a cyclic number.

It is not a de Polignac number, because 165486913 - 2¹ = 165486911 is a prime.

Together with 165486911, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 165486913.

It is not a weakly prime, because it can be changed into another prime (165486911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82743456 + 82743457.

It is an arithmetic number, because the mean of its divisors is an integer number (82743457).

Almost surely, 2^165486913 is an apocalyptic number.

It is an amenable number.

165486913 is a deficient number, since it is larger than the sum of its proper divisors (1).

165486913 is an equidigital number, since it uses as much as digits as its factorization.

165486913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 165486913 is about 12864.1716795136. The cubic root of 165486913 is about 549.0196453278.

The spelling of 165486913 in words is "one hundred sixty-five million, four hundred eighty-six thousand, nine hundred thirteen".