165603241 has 2 divisors, whose sum is σ = 165603242. Its totient is φ = 165603240.

The previous prime is 165603211. The next prime is 165603247. The reversal of 165603241 is 142306561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90174016 + 75429225 = 9496^2 + 8685^2 .

It is a cyclic number.

It is not a de Polignac number, because 165603241 - 2¹³ = 165595049 is a prime.

It is equal to p_9270730 and since 165603241 and 9270730 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (165603247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82801620 + 82801621.

It is an arithmetic number, because the mean of its divisors is an integer number (82801621).

Almost surely, 2^165603241 is an apocalyptic number.

It is an amenable number.

165603241 is a deficient number, since it is larger than the sum of its proper divisors (1).

165603241 is an equidigital number, since it uses as much as digits as its factorization.

165603241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 165603241 is about 12868.6922801037. The cubic root of 165603241 is about 549.1482585157.

The spelling of 165603241 in words is "one hundred sixty-five million, six hundred three thousand, two hundred forty-one".