9999961 has 8 divisors (see below), whose sum is σ = 10692864. Its totient is φ = 9318720.

The previous prime is 9999943. The next prime is 9999971. The reversal of 9999961 is 1699999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9999961 - 2⁵ = 9999929 is a prime.

9999961 is a lucky number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9999899 and 9999908.

It is not an unprimeable number, because it can be changed into a prime (9999901) 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 in 7 ways as a sum of consecutive naturals, for example, 1105 + ... + 4606.

It is an arithmetic number, because the mean of its divisors is an integer number (1336608).

Almost surely, 2^9999961 is an apocalyptic number.

It is an amenable number.

9999961 is a deficient number, since it is larger than the sum of its proper divisors (692903).

9999961 is a wasteful number, since it uses less digits than its factorization.

9999961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5831.

The product of its digits is 354294, while the sum is 52.

The square root of 9999961 is about 3162.2714937209. The cubic root of 9999961 is about 215.4431889263.

The spelling of 9999961 in words is "nine million, nine hundred ninety-nine thousand, nine hundred sixty-one".