9131387 has 2 divisors, whose sum is σ = 9131388. Its totient is φ = 9131386.

The previous prime is 9131383. The next prime is 9131389. The reversal of 9131387 is 7831319.

It is a strong prime.

It is an emirp because it is prime and its reverse (7831319) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9131387 - 2² = 9131383 is a prime.

Together with 9131389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (9131383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4565693 + 4565694.

It is an arithmetic number, because the mean of its divisors is an integer number (4565694).

Almost surely, 2^9131387 is an apocalyptic number.

9131387 is a deficient number, since it is larger than the sum of its proper divisors (1).

9131387 is an equidigital number, since it uses as much as digits as its factorization.

9131387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 9131387 is about 3021.8184922328. The cubic root of 9131387 is about 209.0157035887.

The spelling of 9131387 in words is "nine million, one hundred thirty-one thousand, three hundred eighty-seven".