106785209 has 2 divisors, whose sum is σ = 106785210. Its totient is φ = 106785208.

The previous prime is 106785167. The next prime is 106785223. The reversal of 106785209 is 902587601.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84695209 + 22090000 = 9203^2 + 4700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-106785209 is a prime.

It is a super-2 number, since 2×106785209² = 22806161722347362, 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 (106785509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53392604 + 53392605.

It is an arithmetic number, because the mean of its divisors is an integer number (53392605).

Almost surely, 2^106785209 is an apocalyptic number.

It is an amenable number.

106785209 is a deficient number, since it is larger than the sum of its proper divisors (1).

106785209 is an equidigital number, since it uses as much as digits as its factorization.

106785209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 106785209 is about 10333.6929023462. The cubic root of 106785209 is about 474.4280599040.

The spelling of 106785209 in words is "one hundred six million, seven hundred eighty-five thousand, two hundred nine".