1168580981 has 2 divisors, whose sum is σ = 1168580982. Its totient is φ = 1168580980.

The previous prime is 1168580971. The next prime is 1168580993. The reversal of 1168580981 is 1890858611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1098591025 + 69989956 = 33145^2 + 8366^2 .

It is an emirp because it is prime and its reverse (1890858611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1168580981 - 2¹⁰ = 1168579957 is a prime.

It is a super-2 number, since 2×1168580981² = 2731163018309844722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1168580971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 584290490 + 584290491.

It is an arithmetic number, because the mean of its divisors is an integer number (584290491).

Almost surely, 2^1168580981 is an apocalyptic number.

It is an amenable number.

1168580981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1168580981 is an equidigital number, since it uses as much as digits as its factorization.

1168580981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 47.

The square root of 1168580981 is about 34184.5137598884. The cubic root of 1168580981 is about 1053.3020705773.

The spelling of 1168580981 in words is "one billion, one hundred sixty-eight million, five hundred eighty thousand, nine hundred eighty-one".