85443834391 has 2 divisors, whose sum is σ = 85443834392. Its totient is φ = 85443834390.

The previous prime is 85443834379. The next prime is 85443834479. The reversal of 85443834391 is 19343834458.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85443834391 - 2⁷ = 85443834263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85443834341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42721917195 + 42721917196.

It is an arithmetic number, because the mean of its divisors is an integer number (42721917196).

Almost surely, 2^85443834391 is an apocalyptic number.

85443834391 is a deficient number, since it is larger than the sum of its proper divisors (1).

85443834391 is an equidigital number, since it uses as much as digits as its factorization.

85443834391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4976640, while the sum is 52.

The spelling of 85443834391 in words is "eighty-five billion, four hundred forty-three million, eight hundred thirty-four thousand, three hundred ninety-one".