85409111 has 2 divisors, whose sum is σ = 85409112. Its totient is φ = 85409110.

The previous prime is 85409101. The next prime is 85409113. The reversal of 85409111 is 11190458.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85409111 is a prime.

Together with 85409113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85409113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42704555 + 42704556.

It is an arithmetic number, because the mean of its divisors is an integer number (42704556).

Almost surely, 2^85409111 is an apocalyptic number.

85409111 is a deficient number, since it is larger than the sum of its proper divisors (1).

85409111 is an equidigital number, since it uses as much as digits as its factorization.

85409111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 85409111 is about 9241.7049833892. The cubic root of 85409111 is about 440.3872468914.

Adding to 85409111 its reverse (11190458), we get a palindrome (96599569).

The spelling of 85409111 in words is "eighty-five million, four hundred nine thousand, one hundred eleven".