85738909 has 2 divisors, whose sum is σ = 85738910. Its totient is φ = 85738908.

The previous prime is 85738903. The next prime is 85738927. The reversal of 85738909 is 90983758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54434884 + 31304025 = 7378^2 + 5595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85738909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85738903) 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, 42869454 + 42869455.

It is an arithmetic number, because the mean of its divisors is an integer number (42869455).

Almost surely, 2^85738909 is an apocalyptic number.

It is an amenable number.

85738909 is a deficient number, since it is larger than the sum of its proper divisors (1).

85738909 is an equidigital number, since it uses as much as digits as its factorization.

85738909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 49.

The square root of 85738909 is about 9259.5307116506. The cubic root of 85738909 is about 440.9533546920.

The spelling of 85738909 in words is "eighty-five million, seven hundred thirty-eight thousand, nine hundred nine".