1161318785 has 16 divisors (see below), whose sum is σ = 1522521792. Its totient is φ = 843345600.

The previous prime is 1161318761. The next prime is 1161318787. The reversal of 1161318785 is 5878131611.

It is not a de Polignac number, because 1161318785 - 2¹⁰ = 1161317761 is a prime.

It is a super-2 number, since 2×1161318785² = 2697322640787752450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1161318787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22727 + ... + 53283.

It is an arithmetic number, because the mean of its divisors is an integer number (95157612).

Almost surely, 2^1161318785 is an apocalyptic number.

It is an amenable number.

1161318785 is a deficient number, since it is larger than the sum of its proper divisors (361203007).

1161318785 is a wasteful number, since it uses less digits than its factorization.

1161318785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31264.

The product of its digits is 40320, while the sum is 41.

The square root of 1161318785 is about 34078.1276627693. The cubic root of 1161318785 is about 1051.1156048987.

The spelling of 1161318785 in words is "one billion, one hundred sixty-one million, three hundred eighteen thousand, seven hundred eighty-five".