1160999981 has 2 divisors, whose sum is σ = 1160999982. Its totient is φ = 1160999980.

The previous prime is 1160999971. The next prime is 1161000011. The reversal of 1160999981 is 1899990611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 950488900 + 210511081 = 30830^2 + 14509^2 .

It is an emirp because it is prime and its reverse (1899990611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1160999981 - 2¹⁰ = 1160998957 is a prime.

It is a super-2 number, since 2×1160999981² = 2695841911764000722, 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 (1160999971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580499990 + 580499991.

It is an arithmetic number, because the mean of its divisors is an integer number (580499991).

Almost surely, 2^1160999981 is an apocalyptic number.

It is an amenable number.

1160999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1160999981 is an equidigital number, since it uses as much as digits as its factorization.

1160999981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 53.

The square root of 1160999981 is about 34073.4497959922. The cubic root of 1160999981 is about 1051.0194123826.

The spelling of 1160999981 in words is "one billion, one hundred sixty million, nine hundred ninety-nine thousand, nine hundred eighty-one".