9999161 has 2 divisors, whose sum is σ = 9999162.
Its totient is φ = 9999160.
The previous prime is 9999083. The next prime is 9999163. The reversal of 9999161 is 1619999.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 9703225 + 295936 = 3115^2 + 544^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-9999161 is a prime.
Together with 9999163, it forms a pair of twin primes.
It is a Chen prime.
It is an Ulam number.
It is not a weakly prime, because it can be changed into another prime (9999163) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4999580 + 4999581.
It is an arithmetic number, because the mean of its divisors is an integer number (4999581).
Almost surely, 29999161 is an apocalyptic number.
It is an amenable number.
9999161 is a deficient number, since it is larger than the sum of its proper divisors (1).
9999161 is an equidigital number, since it uses as much as digits as its factorization.
9999161 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 39366, while the sum is 44.
The square root of 9999161 is about 3162.1449998379.
The cubic root of 9999161 is about 215.4374435990.
The spelling of 9999161 in words is "nine million, nine hundred ninety-nine thousand, one hundred sixty-one".