9913881 has 4 divisors (see below), whose sum is σ = 13218512. Its totient is φ = 6609252.

The previous prime is 9913879. The next prime is 9913889. The reversal of 9913881 is 1883199.

It is a happy number.

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: 1883199 = 3 ⋅627733.

It is not a de Polignac number, because 9913881 - 2¹ = 9913879 is a prime.

It is a super-2 number, since 2×9913881² = 196570072964322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9913889) 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, 1652311 + ... + 1652316.

It is an arithmetic number, because the mean of its divisors is an integer number (3304628).

Almost surely, 2^9913881 is an apocalyptic number.

It is an amenable number.

9913881 is a deficient number, since it is larger than the sum of its proper divisors (3304631).

9913881 is a wasteful number, since it uses less digits than its factorization.

9913881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304630.

The product of its digits is 15552, while the sum is 39.

The square root of 9913881 is about 3148.6316075400. The cubic root of 9913881 is about 214.8232258869.

The spelling of 9913881 in words is "nine million, nine hundred thirteen thousand, eight hundred eighty-one".