108138857 has 2 divisors, whose sum is σ = 108138858. Its totient is φ = 108138856.

The previous prime is 108138841. The next prime is 108138859. The reversal of 108138857 is 758831801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107661376 + 477481 = 10376^2 + 691^2 .

It is a cyclic number.

It is not a de Polignac number, because 108138857 - 2⁴ = 108138841 is a prime.

Together with 108138859, 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 (108138859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54069428 + 54069429.

It is an arithmetic number, because the mean of its divisors is an integer number (54069429).

Almost surely, 2^108138857 is an apocalyptic number.

It is an amenable number.

108138857 is a deficient number, since it is larger than the sum of its proper divisors (1).

108138857 is an equidigital number, since it uses as much as digits as its factorization.

108138857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 53760, while the sum is 41.

The square root of 108138857 is about 10398.9834599349. The cubic root of 108138857 is about 476.4243223950.

The spelling of 108138857 in words is "one hundred eight million, one hundred thirty-eight thousand, eight hundred fifty-seven".