1161565161 has 16 divisors (see below), whose sum is σ = 1592107584. Its totient is φ = 752739264.

The previous prime is 1161565109. The next prime is 1161565177. The reversal of 1161565161 is 1615651611.

It is not a de Polignac number, because 1161565161 - 2⁷ = 1161565033 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161565061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130330 + ... + 138956.

It is an arithmetic number, because the mean of its divisors is an integer number (99506724).

Almost surely, 2^1161565161 is an apocalyptic number.

It is an amenable number.

1161565161 is a deficient number, since it is larger than the sum of its proper divisors (430542423).

1161565161 is a wasteful number, since it uses less digits than its factorization.

1161565161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9880.

The product of its digits is 5400, while the sum is 33.

The square root of 1161565161 is about 34081.7423410248. The cubic root of 1161565161 is about 1051.1899317043.

The spelling of 1161565161 in words is "one billion, one hundred sixty-one million, five hundred sixty-five thousand, one hundred sixty-one".