165323281 has 2 divisors, whose sum is σ = 165323282. Its totient is φ = 165323280.

The previous prime is 165323269. The next prime is 165323303. The reversal of 165323281 is 182323561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156650256 + 8673025 = 12516^2 + 2945^2 .

It is a cyclic number.

It is not a de Polignac number, because 165323281 - 2⁹ = 165322769 is a prime.

It is a super-2 number, since 2×165323281² = 54663574481209922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (165323981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82661640 + 82661641.

It is an arithmetic number, because the mean of its divisors is an integer number (82661641).

Almost surely, 2^165323281 is an apocalyptic number.

It is an amenable number.

165323281 is a deficient number, since it is larger than the sum of its proper divisors (1).

165323281 is an equidigital number, since it uses as much as digits as its factorization.

165323281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 165323281 is about 12857.8101168123. The cubic root of 165323281 is about 548.8386303917.

The spelling of 165323281 in words is "one hundred sixty-five million, three hundred twenty-three thousand, two hundred eighty-one".