165361121 has 2 divisors, whose sum is σ = 165361122. Its totient is φ = 165361120.

The previous prime is 165361093. The next prime is 165361151. The reversal of 165361121 is 121163561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138321121 + 27040000 = 11761^2 + 5200^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165361121 is a prime.

It is not a weakly prime, because it can be changed into another prime (165361151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82680560 + 82680561.

It is an arithmetic number, because the mean of its divisors is an integer number (82680561).

Almost surely, 2^165361121 is an apocalyptic number.

It is an amenable number.

165361121 is a deficient number, since it is larger than the sum of its proper divisors (1).

165361121 is an equidigital number, since it uses as much as digits as its factorization.

165361121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1080, while the sum is 26.

The square root of 165361121 is about 12859.2815118108. The cubic root of 165361121 is about 548.8805008195.

The spelling of 165361121 in words is "one hundred sixty-five million, three hundred sixty-one thousand, one hundred twenty-one".