165903317 has 2 divisors, whose sum is σ = 165903318. Its totient is φ = 165903316.

The previous prime is 165903277. The next prime is 165903319. The reversal of 165903317 is 713309561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164891281 + 1012036 = 12841^2 + 1006^2 .

It is a cyclic number.

It is not a de Polignac number, because 165903317 - 2⁶ = 165903253 is a prime.

Together with 165903319, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_9286523 and since 165903317 and 9286523 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165903319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82951658 + 82951659.

It is an arithmetic number, because the mean of its divisors is an integer number (82951659).

Almost surely, 2^165903317 is an apocalyptic number.

It is an amenable number.

165903317 is a deficient number, since it is larger than the sum of its proper divisors (1).

165903317 is an equidigital number, since it uses as much as digits as its factorization.

165903317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 165903317 is about 12880.3461521808. The cubic root of 165903317 is about 549.4797471590.

The spelling of 165903317 in words is "one hundred sixty-five million, nine hundred three thousand, three hundred seventeen".