9951791 has 8 divisors (see below), whose sum is σ = 10243200. Its totient is φ = 9663192.

The previous prime is 9951769. The next prime is 9951793. The reversal of 9951791 is 1971599.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9951791 is a prime.

It is a Duffinian number.

9951791 is a modest number, since divided by 1791 gives 995 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9951793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7976 + ... + 9138.

It is an arithmetic number, because the mean of its divisors is an integer number (1280400).

Almost surely, 2^9951791 is an apocalyptic number.

9951791 is a deficient number, since it is larger than the sum of its proper divisors (291409).

9951791 is a wasteful number, since it uses less digits than its factorization.

9951791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1405.

The product of its digits is 25515, while the sum is 41.

The square root of 9951791 is about 3154.6459389288. The cubic root of 9951791 is about 215.0967006864.

The spelling of 9951791 in words is "nine million, nine hundred fifty-one thousand, seven hundred ninety-one".