1171616161 has 2 divisors, whose sum is σ = 1171616162. Its totient is φ = 1171616160.

The previous prime is 1171616101. The next prime is 1171616189. The reversal of 1171616161 is 1616161711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1021185936 + 150430225 = 31956^2 + 12265^2 .

It is a cyclic number.

It is not a de Polignac number, because 1171616161 - 2¹⁵ = 1171583393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1171616101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585808080 + 585808081.

It is an arithmetic number, because the mean of its divisors is an integer number (585808081).

Almost surely, 2^1171616161 is an apocalyptic number.

It is an amenable number.

1171616161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171616161 is an equidigital number, since it uses as much as digits as its factorization.

1171616161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 31.

The square root of 1171616161 is about 34228.8790497147. The cubic root of 1171616161 is about 1054.2132034163.

Adding to 1171616161 its reverse (1616161711), we get a palindrome (2787777872).

The spelling of 1171616161 in words is "one billion, one hundred seventy-one million, six hundred sixteen thousand, one hundred sixty-one".