1161166081 has 2 divisors, whose sum is σ = 1161166082. Its totient is φ = 1161166080.

The previous prime is 1161166031. The next prime is 1161166087. The reversal of 1161166081 is 1806611611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1153213681 + 7952400 = 33959^2 + 2820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161166081 - 2¹⁵ = 1161133313 is a prime.

It is a super-2 number, since 2×1161166081² = 2696613335329797122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1161166087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580583040 + 580583041.

It is an arithmetic number, because the mean of its divisors is an integer number (580583041).

Almost surely, 2^1161166081 is an apocalyptic number.

It is an amenable number.

1161166081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161166081 is an equidigital number, since it uses as much as digits as its factorization.

1161166081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 1161166081 is about 34075.8870904339. The cubic root of 1161166081 is about 1051.0695318207.

Adding to 1161166081 its reverse (1806611611), we get a palindrome (2967777692).

The spelling of 1161166081 in words is "one billion, one hundred sixty-one million, one hundred sixty-six thousand, eighty-one".