85065521 has 2 divisors, whose sum is σ = 85065522. Its totient is φ = 85065520.

The previous prime is 85065511. The next prime is 85065593. The reversal of 85065521 is 12556058.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85008400 + 57121 = 9220^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 85065521 - 2¹⁴ = 85049137 is a prime.

It is a super-2 number, since 2×85065521² = 14472285726002882, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85065511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42532760 + 42532761.

It is an arithmetic number, because the mean of its divisors is an integer number (42532761).

Almost surely, 2^85065521 is an apocalyptic number.

It is an amenable number.

85065521 is a deficient number, since it is larger than the sum of its proper divisors (1).

85065521 is an equidigital number, since it uses as much as digits as its factorization.

85065521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 85065521 is about 9223.0971479216. The cubic root of 85065521 is about 439.7959125831.

The spelling of 85065521 in words is "eighty-five million, sixty-five thousand, five hundred twenty-one".