165221341 has 2 divisors, whose sum is σ = 165221342. Its totient is φ = 165221340.

The previous prime is 165221333. The next prime is 165221363. The reversal of 165221341 is 143122561.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145106116 + 20115225 = 12046^2 + 4485^2 .

It is an emirp because it is prime and its reverse (143122561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 165221341 - 2³ = 165221333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165221741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82610670 + 82610671.

It is an arithmetic number, because the mean of its divisors is an integer number (82610671).

Almost surely, 2^165221341 is an apocalyptic number.

It is an amenable number.

165221341 is a deficient number, since it is larger than the sum of its proper divisors (1).

165221341 is an equidigital number, since it uses as much as digits as its factorization.

165221341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 25.

The square root of 165221341 is about 12853.8453779404. The cubic root of 165221341 is about 548.7258007223.

The spelling of 165221341 in words is "one hundred sixty-five million, two hundred twenty-one thousand, three hundred forty-one".