85146521 has 2 divisors, whose sum is σ = 85146522. Its totient is φ = 85146520.

The previous prime is 85146511. The next prime is 85146533. The reversal of 85146521 is 12564158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43414921 + 41731600 = 6589^2 + 6460^2 .

It is a cyclic number.

It is not a de Polignac number, because 85146521 - 2¹⁰ = 85145497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85146511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42573260 + 42573261.

It is an arithmetic number, because the mean of its divisors is an integer number (42573261).

Almost surely, 2^85146521 is an apocalyptic number.

It is an amenable number.

85146521 is a deficient number, since it is larger than the sum of its proper divisors (1).

85146521 is an equidigital number, since it uses as much as digits as its factorization.

85146521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 32.

The square root of 85146521 is about 9227.4872527682. The cubic root of 85146521 is about 439.9354605751.

The spelling of 85146521 in words is "eighty-five million, one hundred forty-six thousand, five hundred twenty-one".