85539521 has 2 divisors, whose sum is σ = 85539522. Its totient is φ = 85539520.

The previous prime is 85539511. The next prime is 85539613. The reversal of 85539521 is 12593558.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51480625 + 34058896 = 7175^2 + 5836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85539521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (85539511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42769760 + 42769761.

It is an arithmetic number, because the mean of its divisors is an integer number (42769761).

Almost surely, 2^85539521 is an apocalyptic number.

It is an amenable number.

85539521 is a deficient number, since it is larger than the sum of its proper divisors (1).

85539521 is an equidigital number, since it uses as much as digits as its factorization.

85539521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 38.

The square root of 85539521 is about 9248.7578084843. The cubic root of 85539521 is about 440.6112733245.

The spelling of 85539521 in words is "eighty-five million, five hundred thirty-nine thousand, five hundred twenty-one".