9138851 has 2 divisors, whose sum is σ = 9138852. Its totient is φ = 9138850.

The previous prime is 9138847. The next prime is 9138853. The reversal of 9138851 is 1588319.

9138851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9138851 - 2² = 9138847 is a prime.

Together with 9138853, 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 (9138853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4569425 + 4569426.

It is an arithmetic number, because the mean of its divisors is an integer number (4569426).

Almost surely, 2^9138851 is an apocalyptic number.

9138851 is a deficient number, since it is larger than the sum of its proper divisors (1).

9138851 is an equidigital number, since it uses as much as digits as its factorization.

9138851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 35.

The square root of 9138851 is about 3023.0532578835. The cubic root of 9138851 is about 209.0726379234.

The spelling of 9138851 in words is "nine million, one hundred thirty-eight thousand, eight hundred fifty-one".