9951389 has 4 divisors (see below), whose sum is σ = 11373024. Its totient is φ = 8529756.

The previous prime is 9951377. The next prime is 9951401. The reversal of 9951389 is 9831599.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9831599 = 83 ⋅118453.

It is an interprime number because it is at equal distance from previous prime (9951377) and next prime (9951401).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9951389 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 (9951329) 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, 710807 + ... + 710820.

It is an arithmetic number, because the mean of its divisors is an integer number (2843256).

Almost surely, 2^9951389 is an apocalyptic number.

It is an amenable number.

9951389 is a deficient number, since it is larger than the sum of its proper divisors (1421635).

9951389 is a wasteful number, since it uses less digits than its factorization.

9951389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1421634.

The product of its digits is 87480, while the sum is 44.

The square root of 9951389 is about 3154.5822227357. The cubic root of 9951389 is about 215.0938043890.

The spelling of 9951389 in words is "nine million, nine hundred fifty-one thousand, three hundred eighty-nine".