85224143 has 4 divisors (see below), whose sum is σ = 86668680. Its totient is φ = 83779608.

The previous prime is 85224091. The next prime is 85224149. The reversal of 85224143 is 34142258.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 85224143 - 2⁶ = 85224079 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 (85224149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 722180 + ... + 722297.

It is an arithmetic number, because the mean of its divisors is an integer number (21667170).

Almost surely, 2^85224143 is an apocalyptic number.

85224143 is a deficient number, since it is larger than the sum of its proper divisors (1444537).

85224143 is a wasteful number, since it uses less digits than its factorization.

85224143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1444536.

The product of its digits is 7680, while the sum is 29.

The square root of 85224143 is about 9231.6923150634. The cubic root of 85224143 is about 440.0691058813.

The spelling of 85224143 in words is "eighty-five million, two hundred twenty-four thousand, one hundred forty-three".