85511789 has 6 divisors (see below), whose sum is σ = 93992430. Its totient is φ = 77737880.

The previous prime is 85511771. The next prime is 85511791. The reversal of 85511789 is 98711558.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 58782889 + 26728900 = 7667^2 + 5170^2 .

It is a de Polignac number, because none of the positive numbers 2^k-85511789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85514789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 353234 + ... + 353475.

It is an arithmetic number, because the mean of its divisors is an integer number (15665405).

Almost surely, 2^85511789 is an apocalyptic number.

It is an amenable number.

85511789 is a deficient number, since it is larger than the sum of its proper divisors (8480641).

85511789 is a wasteful number, since it uses less digits than its factorization.

85511789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706731 (or 706720 counting only the distinct ones).

The product of its digits is 100800, while the sum is 44.

The square root of 85511789 is about 9247.2584585919. The cubic root of 85511789 is about 440.5636526365.

The spelling of 85511789 in words is "eighty-five million, five hundred eleven thousand, seven hundred eighty-nine".