165904237 has 2 divisors, whose sum is σ = 165904238. Its totient is φ = 165904236.

The previous prime is 165904177. The next prime is 165904243. The reversal of 165904237 is 732409561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158608836 + 7295401 = 12594^2 + 2701^2 .

It is a cyclic number.

It is not a de Polignac number, because 165904237 - 2¹¹ = 165902189 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 165904196 and 165904205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165907237) 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, 82952118 + 82952119.

It is an arithmetic number, because the mean of its divisors is an integer number (82952119).

Almost surely, 2^165904237 is an apocalyptic number.

It is an amenable number.

165904237 is a deficient number, since it is larger than the sum of its proper divisors (1).

165904237 is an equidigital number, since it uses as much as digits as its factorization.

165904237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 165904237 is about 12880.3818654573. The cubic root of 165904237 is about 549.4807628519.

The spelling of 165904237 in words is "one hundred sixty-five million, nine hundred four thousand, two hundred thirty-seven".