85172539 has 8 divisors (see below), whose sum is σ = 87373440. Its totient is φ = 82977600.

The previous prime is 85172453. The next prime is 85172561. The reversal of 85172539 is 93527158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85172539 - 2⁷ = 85172411 is a prime.

It is a super-2 number, since 2×85172539² = 14508722799413042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85172579) 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 7 ways as a sum of consecutive naturals, for example, 47542 + ... + 49300.

It is an arithmetic number, because the mean of its divisors is an integer number (10921680).

Almost surely, 2^85172539 is an apocalyptic number.

85172539 is a deficient number, since it is larger than the sum of its proper divisors (2200901).

85172539 is a wasteful number, since it uses less digits than its factorization.

85172539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2981.

The product of its digits is 75600, while the sum is 40.

The square root of 85172539 is about 9228.8969546745. The cubic root of 85172539 is about 439.9802659882.

The spelling of 85172539 in words is "eighty-five million, one hundred seventy-two thousand, five hundred thirty-nine".