165903319 has 2 divisors, whose sum is σ = 165903320. Its totient is φ = 165903318.

The previous prime is 165903317. The next prime is 165903349. The reversal of 165903319 is 913309561.

It is a weak prime.

It is an emirp because it is prime and its reverse (913309561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165903319 - 2¹ = 165903317 is a prime.

It is a super-2 number, since 2×165903319² = 55047822510431522, which contains 22 as substring.

Together with 165903317, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165903317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82951659 + 82951660.

It is an arithmetic number, because the mean of its divisors is an integer number (82951660).

Almost surely, 2^165903319 is an apocalyptic number.

165903319 is a deficient number, since it is larger than the sum of its proper divisors (1).

165903319 is an equidigital number, since it uses as much as digits as its factorization.

165903319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 165903319 is about 12880.3462298185. The cubic root of 165903319 is about 549.4797493671.

The spelling of 165903319 in words is "one hundred sixty-five million, nine hundred three thousand, three hundred nineteen".