85671139 has 2 divisors, whose sum is σ = 85671140. Its totient is φ = 85671138.

The previous prime is 85671119. The next prime is 85671151. The reversal of 85671139 is 93117658.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85671139 - 2⁵ = 85671107 is a prime.

It is a Chen prime.

It is equal to p_4980487 and since 85671139 and 4980487 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (85671119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42835569 + 42835570.

It is an arithmetic number, because the mean of its divisors is an integer number (42835570).

Almost surely, 2^85671139 is an apocalyptic number.

85671139 is a deficient number, since it is larger than the sum of its proper divisors (1).

85671139 is an equidigital number, since it uses as much as digits as its factorization.

85671139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 85671139 is about 9255.8705155161. The cubic root of 85671139 is about 440.8371441867.

The spelling of 85671139 in words is "eighty-five million, six hundred seventy-one thousand, one hundred thirty-nine".