85124521 has 2 divisors, whose sum is σ = 85124522. Its totient is φ = 85124520.

The previous prime is 85124513. The next prime is 85124597. The reversal of 85124521 is 12542158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82355625 + 2768896 = 9075^2 + 1664^2 .

It is a cyclic number.

It is not a de Polignac number, because 85124521 - 2³ = 85124513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 85124521.

It is not a weakly prime, because it can be changed into another prime (85124021) 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 as a sum of consecutive naturals, namely, 42562260 + 42562261.

It is an arithmetic number, because the mean of its divisors is an integer number (42562261).

Almost surely, 2^85124521 is an apocalyptic number.

It is an amenable number.

85124521 is a deficient number, since it is larger than the sum of its proper divisors (1).

85124521 is an equidigital number, since it uses as much as digits as its factorization.

85124521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3200, while the sum is 28.

The square root of 85124521 is about 9226.2950852441. The cubic root of 85124521 is about 439.8975674088.

Adding to 85124521 its reverse (12542158), we get a palindrome (97666679).

The spelling of 85124521 in words is "eighty-five million, one hundred twenty-four thousand, five hundred twenty-one".