9945161 has 2 divisors, whose sum is σ = 9945162. Its totient is φ = 9945160.

The previous prime is 9945157. The next prime is 9945181. The reversal of 9945161 is 1615499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5664400 + 4280761 = 2380^2 + 2069^2 .

It is an emirp because it is prime and its reverse (1615499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9945161 - 2² = 9945157 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9945101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4972580 + 4972581.

It is an arithmetic number, because the mean of its divisors is an integer number (4972581).

Almost surely, 2^9945161 is an apocalyptic number.

It is an amenable number.

9945161 is a deficient number, since it is larger than the sum of its proper divisors (1).

9945161 is an equidigital number, since it uses as much as digits as its factorization.

9945161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 35.

The square root of 9945161 is about 3153.5949327712. The cubic root of 9945161 is about 215.0489234258.

The spelling of 9945161 in words is "nine million, nine hundred forty-five thousand, one hundred sixty-one".