85884521 has 2 divisors, whose sum is σ = 85884522. Its totient is φ = 85884520.

The previous prime is 85884497. The next prime is 85884551. The reversal of 85884521 is 12548858.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83466496 + 2418025 = 9136^2 + 1555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85884521 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 (85884551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42942260 + 42942261.

It is an arithmetic number, because the mean of its divisors is an integer number (42942261).

Almost surely, 2^85884521 is an apocalyptic number.

It is an amenable number.

85884521 is a deficient number, since it is larger than the sum of its proper divisors (1).

85884521 is an equidigital number, since it uses as much as digits as its factorization.

85884521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102400, while the sum is 41.

The square root of 85884521 is about 9267.3901935766. The cubic root of 85884521 is about 441.2028399656.

The spelling of 85884521 in words is "eighty-five million, eight hundred eighty-four thousand, five hundred twenty-one".