165223549 has 2 divisors, whose sum is σ = 165223550. Its totient is φ = 165223548.

The previous prime is 165223547. The next prime is 165223573. The reversal of 165223549 is 945322561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 164942649 + 280900 = 12843^2 + 530^2 .

It is a cyclic number.

It is not a de Polignac number, because 165223549 - 2¹ = 165223547 is a prime.

It is a super-2 number, since 2×165223549² = 54597642288310802, which contains 22 as substring.

Together with 165223547, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165223543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82611774 + 82611775.

It is an arithmetic number, because the mean of its divisors is an integer number (82611775).

Almost surely, 2^165223549 is an apocalyptic number.

It is an amenable number.

165223549 is a deficient number, since it is larger than the sum of its proper divisors (1).

165223549 is an equidigital number, since it uses as much as digits as its factorization.

165223549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 37.

The square root of 165223549 is about 12853.9312663481. The cubic root of 165223549 is about 548.7282450820.

The spelling of 165223549 in words is "one hundred sixty-five million, two hundred twenty-three thousand, five hundred forty-nine".