1161871065 has 24 divisors (see below), whose sum is σ = 2018594760. Its totient is φ = 618223104.

The previous prime is 1161871063. The next prime is 1161871097. The reversal of 1161871065 is 5601781611.

It can be written as a sum of positive squares in 4 ways, for example, as 15303744 + 1146567321 = 3912^2 + 33861^2 .

It is not a de Polignac number, because 1161871065 - 2¹ = 1161871063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1161871063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10330 + ... + 49299.

It is an arithmetic number, because the mean of its divisors is an integer number (84108115).

Almost surely, 2^1161871065 is an apocalyptic number.

1161871065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1161871065 is a deficient number, since it is larger than the sum of its proper divisors (856723695).

1161871065 is a wasteful number, since it uses less digits than its factorization.

1161871065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60073 (or 60070 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The square root of 1161871065 is about 34086.2298443228. The cubic root of 1161871065 is about 1051.2822023151.

The spelling of 1161871065 in words is "one billion, one hundred sixty-one million, eight hundred seventy-one thousand, sixty-five".