101606209 has 2 divisors, whose sum is σ = 101606210. Its totient is φ = 101606208.

The previous prime is 101606207. The next prime is 101606221. The reversal of 101606209 is 902606101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100801600 + 804609 = 10040^2 + 897^2 .

It is an emirp because it is prime and its reverse (902606101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101606209 - 2¹ = 101606207 is a prime.

Together with 101606207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (101606207) 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, 50803104 + 50803105.

It is an arithmetic number, because the mean of its divisors is an integer number (50803105).

Almost surely, 2^101606209 is an apocalyptic number.

It is an amenable number.

101606209 is a deficient number, since it is larger than the sum of its proper divisors (1).

101606209 is an equidigital number, since it uses as much as digits as its factorization.

101606209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 101606209 is about 10079.9905257892. The cubic root of 101606209 is about 466.6308160101.

The spelling of 101606209 in words is "one hundred one million, six hundred six thousand, two hundred nine".