9990751 has 8 divisors (see below), whose sum is σ = 10550000. Its totient is φ = 9434880.

The previous prime is 9990737. The next prime is 9990767. The reversal of 9990751 is 1570999.

9990751 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 9990751 - 2¹⁷ = 9859679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990731) 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, 7375 + ... + 8623.

It is an arithmetic number, because the mean of its divisors is an integer number (1318750).

Almost surely, 2^9990751 is an apocalyptic number.

9990751 is a deficient number, since it is larger than the sum of its proper divisors (559249).

9990751 is a wasteful number, since it uses less digits than its factorization.

9990751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1689.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 9990751 is about 3160.8149265656. The cubic root of 9990751 is about 215.3770272935.

The spelling of 9990751 in words is "nine million, nine hundred ninety thousand, seven hundred fifty-one".