165469181 has 2 divisors, whose sum is σ = 165469182. Its totient is φ = 165469180.

The previous prime is 165469159. The next prime is 165469201. The reversal of 165469181 is 181964561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128368900 + 37100281 = 11330^2 + 6091^2 .

It is a cyclic number.

It is not a de Polignac number, because 165469181 - 2²² = 161274877 is a prime.

It is a super-2 number, since 2×165469181² = 54760099721621522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165469151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82734590 + 82734591.

It is an arithmetic number, because the mean of its divisors is an integer number (82734591).

Almost surely, 2^165469181 is an apocalyptic number.

It is an amenable number.

165469181 is a deficient number, since it is larger than the sum of its proper divisors (1).

165469181 is an equidigital number, since it uses as much as digits as its factorization.

165469181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 41.

The square root of 165469181 is about 12863.4824600495. The cubic root of 165469181 is about 549.0000353903. Note that the first 4 decimals are identical.

The spelling of 165469181 in words is "one hundred sixty-five million, four hundred sixty-nine thousand, one hundred eighty-one".