85684493 has 2 divisors, whose sum is σ = 85684494. Its totient is φ = 85684492.

The previous prime is 85684481. The next prime is 85684507. The reversal of 85684493 is 39448658.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77827684 + 7856809 = 8822^2 + 2803^2 .

It is a cyclic number.

It is not a de Polignac number, because 85684493 - 2⁸ = 85684237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85684463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42842246 + 42842247.

It is an arithmetic number, because the mean of its divisors is an integer number (42842247).

Almost surely, 2^85684493 is an apocalyptic number.

It is an amenable number.

85684493 is a deficient number, since it is larger than the sum of its proper divisors (1).

85684493 is an equidigital number, since it uses as much as digits as its factorization.

85684493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 829440, while the sum is 47.

The square root of 85684493 is about 9256.5918674208. The cubic root of 85684493 is about 440.8600481791.

The spelling of 85684493 in words is "eighty-five million, six hundred eighty-four thousand, four hundred ninety-three".