85328681 has 2 divisors, whose sum is σ = 85328682. Its totient is φ = 85328680.

The previous prime is 85328671. The next prime is 85328693. The reversal of 85328681 is 18682358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50282281 + 35046400 = 7091^2 + 5920^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85328681 is a prime.

It is a super-2 number, since 2×85328681² = 14561967602399522, which contains 22 as substring.

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 (85328651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42664340 + 42664341.

It is an arithmetic number, because the mean of its divisors is an integer number (42664341).

Almost surely, 2^85328681 is an apocalyptic number.

It is an amenable number.

85328681 is a deficient number, since it is larger than the sum of its proper divisors (1).

85328681 is an equidigital number, since it uses as much as digits as its factorization.

85328681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 41.

The square root of 85328681 is about 9237.3524886734. The cubic root of 85328681 is about 440.2489655061.

The spelling of 85328681 in words is "eighty-five million, three hundred twenty-eight thousand, six hundred eighty-one".