9138931 has 2 divisors, whose sum is σ = 9138932. Its totient is φ = 9138930.

The previous prime is 9138929. The next prime is 9138947. The reversal of 9138931 is 1398319.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9138931 - 2¹ = 9138929 is a prime.

It is a super-2 number, since 2×9138931² = 167040119645522, which contains 22 as substring.

Together with 9138929, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (9138991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4569465 + 4569466.

It is an arithmetic number, because the mean of its divisors is an integer number (4569466).

Almost surely, 2^9138931 is an apocalyptic number.

9138931 is a deficient number, since it is larger than the sum of its proper divisors (1).

9138931 is an equidigital number, since it uses as much as digits as its factorization.

9138931 is an evil number, because the sum of its binary digits is even.

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

The square root of 9138931 is about 3023.0664895103. The cubic root of 9138931 is about 209.0732479841.

The spelling of 9138931 in words is "nine million, one hundred thirty-eight thousand, nine hundred thirty-one".