1205051161 has 2 divisors, whose sum is σ = 1205051162. Its totient is φ = 1205051160.

The previous prime is 1205051153. The next prime is 1205051201. The reversal of 1205051161 is 1611505021.

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., 1053391936 + 151659225 = 32456^2 + 12315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1205051161 - 2³ = 1205051153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1205052161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602525580 + 602525581.

It is an arithmetic number, because the mean of its divisors is an integer number (602525581).

Almost surely, 2^1205051161 is an apocalyptic number.

It is an amenable number.

1205051161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205051161 is an equidigital number, since it uses as much as digits as its factorization.

1205051161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 22.

The square root of 1205051161 is about 34713.8468193889. The cubic root of 1205051161 is about 1064.1474985491.

Adding to 1205051161 its reverse (1611505021), we get a palindrome (2816556182).

The spelling of 1205051161 in words is "one billion, two hundred five million, fifty-one thousand, one hundred sixty-one".