9878131 has 4 divisors (see below), whose sum is σ = 10088352. Its totient is φ = 9667912.

The previous prime is 9878129. The next prime is 9878147. The reversal of 9878131 is 1318789.

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 9878131 - 2¹ = 9878129 is a prime.

It is a super-2 number, since 2×9878131² = 195154944106322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9878101) 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, 105040 + ... + 105133.

It is an arithmetic number, because the mean of its divisors is an integer number (2522088).

Almost surely, 2^9878131 is an apocalyptic number.

9878131 is a deficient number, since it is larger than the sum of its proper divisors (210221).

9878131 is a wasteful number, since it uses less digits than its factorization.

9878131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210220.

The product of its digits is 12096, while the sum is 37.

The square root of 9878131 is about 3142.9494109833. The cubic root of 9878131 is about 214.5646934218.

The spelling of 9878131 in words is "nine million, eight hundred seventy-eight thousand, one hundred thirty-one".