85152521 has 2 divisors, whose sum is σ = 85152522. Its totient is φ = 85152520.

The previous prime is 85152493. The next prime is 85152527. The reversal of 85152521 is 12525158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64176121 + 20976400 = 8011^2 + 4580^2 .

It is a cyclic number.

It is not a de Polignac number, because 85152521 - 2²⁶ = 18043657 is a prime.

It is a Chen prime.

It is equal to p_4952027 and since 85152521 and 4952027 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (85152527) 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 as a sum of consecutive naturals, namely, 42576260 + 42576261.

It is an arithmetic number, because the mean of its divisors is an integer number (42576261).

Almost surely, 2^85152521 is an apocalyptic number.

It is an amenable number.

85152521 is a deficient number, since it is larger than the sum of its proper divisors (1).

85152521 is an equidigital number, since it uses as much as digits as its factorization.

85152521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4000, while the sum is 29.

The square root of 85152521 is about 9227.8123626350. The cubic root of 85152521 is about 439.9457939422.

Adding to 85152521 its reverse (12525158), we get a palindrome (97677679).

The spelling of 85152521 in words is "eighty-five million, one hundred fifty-two thousand, five hundred twenty-one".