85909071139 has 2 divisors, whose sum is σ = 85909071140. Its totient is φ = 85909071138.

The previous prime is 85909071137. The next prime is 85909071151. The reversal of 85909071139 is 93117090958.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85909071139 - 2¹ = 85909071137 is a prime.

Together with 85909071137, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (85909071137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42954535569 + 42954535570.

It is an arithmetic number, because the mean of its divisors is an integer number (42954535570).

Almost surely, 2^85909071139 is an apocalyptic number.

85909071139 is a deficient number, since it is larger than the sum of its proper divisors (1).

85909071139 is an equidigital number, since it uses as much as digits as its factorization.

85909071139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 52.

The spelling of 85909071139 in words is "eighty-five billion, nine hundred nine million, seventy-one thousand, one hundred thirty-nine".