9951681 has 8 divisors (see below), whose sum is σ = 14049504. Its totient is φ = 6244160.

The previous prime is 9951637. The next prime is 9951701. The reversal of 9951681 is 1861599.

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

It is a cyclic number.

It is not a de Polignac number, because 9951681 - 2¹⁰ = 9950657 is a prime.

It is a super-2 number, since 2×9951681² = 198071909451522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9951181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97515 + ... + 97616.

It is an arithmetic number, because the mean of its divisors is an integer number (1756188).

Almost surely, 2^9951681 is an apocalyptic number.

It is an amenable number.

9951681 is a deficient number, since it is larger than the sum of its proper divisors (4097823).

9951681 is a wasteful number, since it uses less digits than its factorization.

9951681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195151.

The product of its digits is 19440, while the sum is 39.

The square root of 9951681 is about 3154.6285042775. The cubic root of 9951681 is about 215.0959081750.

The spelling of 9951681 in words is "nine million, nine hundred fifty-one thousand, six hundred eighty-one".