85228121 has 4 divisors (see below), whose sum is σ = 92976144. Its totient is φ = 77480100.

The previous prime is 85228079. The next prime is 85228153. The reversal of 85228121 is 12182258.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 85228121 - 2¹⁰ = 85227097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85228421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3873995 + ... + 3874016.

It is an arithmetic number, because the mean of its divisors is an integer number (23244036).

Almost surely, 2^85228121 is an apocalyptic number.

It is an amenable number.

85228121 is a deficient number, since it is larger than the sum of its proper divisors (7748023).

85228121 is a wasteful number, since it uses less digits than its factorization.

85228121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7748022.

The product of its digits is 2560, while the sum is 29.

The square root of 85228121 is about 9231.9077660037. The cubic root of 85228121 is about 440.0759527974.

The spelling of 85228121 in words is "eighty-five million, two hundred twenty-eight thousand, one hundred twenty-one".