165992371 has 2 divisors, whose sum is σ = 165992372. Its totient is φ = 165992370.

The previous prime is 165992363. The next prime is 165992381. The reversal of 165992371 is 173299561.

It is a weak prime.

It is an emirp because it is prime and its reverse (173299561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165992371 - 2³ = 165992363 is a prime.

It is not a weakly prime, because it can be changed into another prime (165992381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82996185 + 82996186.

It is an arithmetic number, because the mean of its divisors is an integer number (82996186).

Almost surely, 2^165992371 is an apocalyptic number.

165992371 is a deficient number, since it is larger than the sum of its proper divisors (1).

165992371 is an equidigital number, since it uses as much as digits as its factorization.

165992371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 102060, while the sum is 43.

The square root of 165992371 is about 12883.8026607054. The cubic root of 165992371 is about 549.5780466132.

The spelling of 165992371 in words is "one hundred sixty-five million, nine hundred ninety-two thousand, three hundred seventy-one".