165791893 has 2 divisors, whose sum is σ = 165791894. Its totient is φ = 165791892.

The previous prime is 165791881. The next prime is 165791909. The reversal of 165791893 is 398197561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121396324 + 44395569 = 11018^2 + 6663^2 .

It is an emirp because it is prime and its reverse (398197561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165791893 - 2⁵ = 165791861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165791393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82895946 + 82895947.

It is an arithmetic number, because the mean of its divisors is an integer number (82895947).

Almost surely, 2^165791893 is an apocalyptic number.

It is an amenable number.

165791893 is a deficient number, since it is larger than the sum of its proper divisors (1).

165791893 is an equidigital number, since it uses as much as digits as its factorization.

165791893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 49.

The square root of 165791893 is about 12876.0200760949. The cubic root of 165791893 is about 549.3567057309.

The spelling of 165791893 in words is "one hundred sixty-five million, seven hundred ninety-one thousand, eight hundred ninety-three".