85134721 has 4 divisors (see below), whose sum is σ = 97296832. Its totient is φ = 72972612.

The previous prime is 85134713. The next prime is 85134733. The reversal of 85134721 is 12743158.

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: 12743158 = 2 ⋅6371579.

It is a cyclic number.

It is not a de Polignac number, because 85134721 - 2³ = 85134713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85134121) 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, 6081045 + ... + 6081058.

It is an arithmetic number, because the mean of its divisors is an integer number (24324208).

Almost surely, 2^85134721 is an apocalyptic number.

It is an amenable number.

85134721 is a deficient number, since it is larger than the sum of its proper divisors (12162111).

85134721 is a wasteful number, since it uses less digits than its factorization.

85134721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12162110.

The product of its digits is 6720, while the sum is 31.

The square root of 85134721 is about 9226.8478366125. The cubic root of 85134721 is about 439.9151368704.

Adding to 85134721 its reverse (12743158), we get a palindrome (97877879).

The spelling of 85134721 in words is "eighty-five million, one hundred thirty-four thousand, seven hundred twenty-one".