85243649 has 2 divisors, whose sum is σ = 85243650. Its totient is φ = 85243648.

The previous prime is 85243643. The next prime is 85243699. The reversal of 85243649 is 94634258.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 14010049 = 8440^2 + 3743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85243649 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (85243643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42621824 + 42621825.

It is an arithmetic number, because the mean of its divisors is an integer number (42621825).

Almost surely, 2^85243649 is an apocalyptic number.

It is an amenable number.

85243649 is a deficient number, since it is larger than the sum of its proper divisors (1).

85243649 is an equidigital number, since it uses as much as digits as its factorization.

85243649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 41.

The square root of 85243649 is about 9232.7487239716. The cubic root of 85243649 is about 440.1026774838.

The spelling of 85243649 in words is "eighty-five million, two hundred forty-three thousand, six hundred forty-nine".