161205241 has 2 divisors, whose sum is σ = 161205242. Its totient is φ = 161205240.

The previous prime is 161205227. The next prime is 161205257. The reversal of 161205241 is 142502161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112275216 + 48930025 = 10596^2 + 6995^2 .

It is a cyclic number.

It is not a de Polignac number, because 161205241 - 2¹⁷ = 161074169 is a prime.

It is not a weakly prime, because it can be changed into another prime (161205211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80602620 + 80602621.

It is an arithmetic number, because the mean of its divisors is an integer number (80602621).

Almost surely, 2^161205241 is an apocalyptic number.

It is an amenable number.

161205241 is a deficient number, since it is larger than the sum of its proper divisors (1).

161205241 is an equidigital number, since it uses as much as digits as its factorization.

161205241 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 161205241 is about 12696.6625929809. The cubic root of 161205241 is about 544.2432512641.

The spelling of 161205241 in words is "one hundred sixty-one million, two hundred five thousand, two hundred forty-one".