165832181 has 2 divisors, whose sum is σ = 165832182. Its totient is φ = 165832180.

The previous prime is 165832159. The next prime is 165832193. The reversal of 165832181 is 181238561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164891281 + 940900 = 12841^2 + 970^2 .

It is a cyclic number.

It is not a de Polignac number, because 165832181 - 2²² = 161637877 is a prime.

It is a super-2 number, since 2×165832181² = 55000624510433522, which contains 22 as substring.

It is a Chen prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165832111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82916090 + 82916091.

It is an arithmetic number, because the mean of its divisors is an integer number (82916091).

Almost surely, 2^165832181 is an apocalyptic number.

It is an amenable number.

165832181 is a deficient number, since it is larger than the sum of its proper divisors (1).

165832181 is an equidigital number, since it uses as much as digits as its factorization.

165832181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 35.

The square root of 165832181 is about 12877.5844396377. The cubic root of 165832181 is about 549.4012006497.

The spelling of 165832181 in words is "one hundred sixty-five million, eight hundred thirty-two thousand, one hundred eighty-one".