9964891 has 4 divisors (see below), whose sum is σ = 9978192. Its totient is φ = 9951592.

The previous prime is 9964883. The next prime is 9964909. The reversal of 9964891 is 1984699.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1984699 = 17 ⋅116747.

It is a cyclic number.

It is not a de Polignac number, because 9964891 - 2³ = 9964883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9964811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5455 + ... + 7048.

It is an arithmetic number, because the mean of its divisors is an integer number (2494548).

Almost surely, 2^9964891 is an apocalyptic number.

9964891 is a deficient number, since it is larger than the sum of its proper divisors (13301).

9964891 is a wasteful number, since it uses less digits than its factorization.

9964891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13300.

The product of its digits is 139968, while the sum is 46.

The square root of 9964891 is about 3156.7215588328. The cubic root of 9964891 is about 215.1910398627.

The spelling of 9964891 in words is "nine million, nine hundred sixty-four thousand, eight hundred ninety-one".