85555111 has 2 divisors, whose sum is σ = 85555112. Its totient is φ = 85555110.

The previous prime is 85555103. The next prime is 85555117. The reversal of 85555111 is 11155558.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85555111 - 2³ = 85555103 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85555117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42777555 + 42777556.

It is an arithmetic number, because the mean of its divisors is an integer number (42777556).

Almost surely, 2^85555111 is an apocalyptic number.

85555111 is a deficient number, since it is larger than the sum of its proper divisors (1).

85555111 is an equidigital number, since it uses as much as digits as its factorization.

85555111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5000, while the sum is 31.

The square root of 85555111 is about 9249.6005859713. The cubic root of 85555111 is about 440.6380395584.

The spelling of 85555111 in words is "eighty-five million, five hundred fifty-five thousand, one hundred eleven".