165812329 has 2 divisors, whose sum is σ = 165812330. Its totient is φ = 165812328.

The previous prime is 165812293. The next prime is 165812341. The reversal of 165812329 is 923218561.

Together with previous prime (165812293) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164865600 + 946729 = 12840^2 + 973^2 .

It is a cyclic number.

It is not a de Polignac number, because 165812329 - 2⁷ = 165812201 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (165812629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82906164 + 82906165.

It is an arithmetic number, because the mean of its divisors is an integer number (82906165).

Almost surely, 2^165812329 is an apocalyptic number.

It is an amenable number.

165812329 is a deficient number, since it is larger than the sum of its proper divisors (1).

165812329 is an equidigital number, since it uses as much as digits as its factorization.

165812329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 165812329 is about 12876.8136198362. The cubic root of 165812329 is about 549.3792765820.

It can be divided in two parts, 16 and 5812329, that added together give a triangular number (5812345 = T₃₄₀₉).

The spelling of 165812329 in words is "one hundred sixty-five million, eight hundred twelve thousand, three hundred twenty-nine".