8931139 has 4 divisors (see below), whose sum is σ = 10207024. Its totient is φ = 7655256.

The previous prime is 8931119. The next prime is 8931149. The reversal of 8931139 is 9311398.

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

It is not a de Polignac number, because 8931139 - 2²¹ = 6833987 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 (8931119) 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, 637932 + ... + 637945.

It is an arithmetic number, because the mean of its divisors is an integer number (2551756).

Almost surely, 2^8931139 is an apocalyptic number.

8931139 is a deficient number, since it is larger than the sum of its proper divisors (1275885).

8931139 is a wasteful number, since it uses less digits than its factorization.

8931139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275884.

The product of its digits is 5832, while the sum is 34.

The square root of 8931139 is about 2988.5011293289. The cubic root of 8931139 is about 207.4765173987.

The spelling of 8931139 in words is "eight million, nine hundred thirty-one thousand, one hundred thirty-nine".