85989391 has 2 divisors, whose sum is σ = 85989392. Its totient is φ = 85989390.

The previous prime is 85989389. The next prime is 85989403. The reversal of 85989391 is 19398958.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 85989391 - 2¹ = 85989389 is a prime.

Together with 85989389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85989311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42994695 + 42994696.

It is an arithmetic number, because the mean of its divisors is an integer number (42994696).

Almost surely, 2^85989391 is an apocalyptic number.

85989391 is a deficient number, since it is larger than the sum of its proper divisors (1).

85989391 is an equidigital number, since it uses as much as digits as its factorization.

85989391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 52.

The square root of 85989391 is about 9273.0464789086. The cubic root of 85989391 is about 441.3823450410.

The spelling of 85989391 in words is "eighty-five million, nine hundred eighty-nine thousand, three hundred ninety-one".