9989951 has 4 divisors (see below), whose sum is σ = 10004904. Its totient is φ = 9975000.

The previous prime is 9989927. The next prime is 9989957. The reversal of 9989951 is 1599899.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9989951 - 2⁶ = 9989887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9989951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9989957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6425 + ... + 7826.

It is an arithmetic number, because the mean of its divisors is an integer number (2501226).

Almost surely, 2^9989951 is an apocalyptic number.

9989951 is a deficient number, since it is larger than the sum of its proper divisors (14953).

9989951 is a wasteful number, since it uses less digits than its factorization.

9989951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14952.

The product of its digits is 262440, while the sum is 50.

The square root of 9989951 is about 3160.6883743894. The cubic root of 9989951 is about 215.3712784357.

The spelling of 9989951 in words is "nine million, nine hundred eighty-nine thousand, nine hundred fifty-one".