8557139 has 2 divisors, whose sum is σ = 8557140. Its totient is φ = 8557138.

The previous prime is 8557123. The next prime is 8557169. The reversal of 8557139 is 9317558.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8557139 - 2⁴ = 8557123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8557169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4278569 + 4278570.

It is an arithmetic number, because the mean of its divisors is an integer number (4278570).

Almost surely, 2^8557139 is an apocalyptic number.

8557139 is a deficient number, since it is larger than the sum of its proper divisors (1).

8557139 is an equidigital number, since it uses as much as digits as its factorization.

8557139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 38.

The square root of 8557139 is about 2925.2587919704. The cubic root of 8557139 is about 204.5390316517.

The spelling of 8557139 in words is "eight million, five hundred fifty-seven thousand, one hundred thirty-nine".