9161662021 has 2 divisors, whose sum is σ = 9161662022. Its totient is φ = 9161662020.

The previous prime is 9161662009. The next prime is 9161662039. The reversal of 9161662021 is 1202661619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9065896225 + 95765796 = 95215^2 + 9786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9161662021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9161662121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4580831010 + 4580831011.

It is an arithmetic number, because the mean of its divisors is an integer number (4580831011).

Almost surely, 2^9161662021 is an apocalyptic number.

It is an amenable number.

9161662021 is a deficient number, since it is larger than the sum of its proper divisors (1).

9161662021 is an equidigital number, since it uses as much as digits as its factorization.

9161662021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 9161662021 is about 95716.5712977643. The cubic root of 9161662021 is about 2092.4644525097.

The spelling of 9161662021 in words is "nine billion, one hundred sixty-one million, six hundred sixty-two thousand, twenty-one".