1161204409 has 2 divisors, whose sum is σ = 1161204410. Its totient is φ = 1161204408.

The previous prime is 1161204367. The next prime is 1161204439. The reversal of 1161204409 is 9044021611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 776848384 + 384356025 = 27872^2 + 19605^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161204409 - 2⁷ = 1161204281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1161204439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580602204 + 580602205.

It is an arithmetic number, because the mean of its divisors is an integer number (580602205).

Almost surely, 2^1161204409 is an apocalyptic number.

It is an amenable number.

1161204409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161204409 is an equidigital number, since it uses as much as digits as its factorization.

1161204409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 1161204409 is about 34076.4494776084. The cubic root of 1161204409 is about 1051.0810963305.

The spelling of 1161204409 in words is "one billion, one hundred sixty-one million, two hundred four thousand, four hundred nine".