8939391831 has 12 divisors (see below), whose sum is σ = 12958085608. Its totient is φ = 5938534224.

The previous prime is 8939391803. The next prime is 8939391847. The reversal of 8939391831 is 1381939398.

It is not a de Polignac number, because 8939391831 - 2⁹ = 8939391319 is a prime.

It is a super-2 number, since 2×8939391831² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8939391631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1752340 + ... + 1757433.

Almost surely, 2^8939391831 is an apocalyptic number.

8939391831 is a deficient number, since it is larger than the sum of its proper divisors (4018693777).

8939391831 is a wasteful number, since it uses less digits than its factorization.

8939391831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510062 (or 3510059 counting only the distinct ones).

The product of its digits is 1259712, while the sum is 54.

The square root of 8939391831 is about 94548.3571036536. The cubic root of 8939391831 is about 2075.4040404286.

The spelling of 8939391831 in words is "eight billion, nine hundred thirty-nine million, three hundred ninety-one thousand, eight hundred thirty-one".