85721573 has 4 divisors (see below), whose sum is σ = 97967520. Its totient is φ = 73475628.

The previous prime is 85721569. The next prime is 85721627. The reversal of 85721573 is 37512758.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37512758 = 2 ⋅18756379.

It is a cyclic number.

It is not a de Polignac number, because 85721573 - 2² = 85721569 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85721173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6122963 + ... + 6122976.

It is an arithmetic number, because the mean of its divisors is an integer number (24491880).

Almost surely, 2^85721573 is an apocalyptic number.

It is an amenable number.

85721573 is a deficient number, since it is larger than the sum of its proper divisors (12245947).

85721573 is a wasteful number, since it uses less digits than its factorization.

85721573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12245946.

The product of its digits is 58800, while the sum is 38.

The square root of 85721573 is about 9258.5945477702. The cubic root of 85721573 is about 440.9236331310.

The spelling of 85721573 in words is "eighty-five million, seven hundred twenty-one thousand, five hundred seventy-three".