209065001 has 2 divisors, whose sum is σ = 209065002. Its totient is φ = 209065000.

The previous prime is 209064979. The next prime is 209065049. The reversal of 209065001 is 100560902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192654400 + 16410601 = 13880^2 + 4051^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209065001 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (209065081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104532500 + 104532501.

It is an arithmetic number, because the mean of its divisors is an integer number (104532501).

Almost surely, 2^209065001 is an apocalyptic number.

It is an amenable number.

209065001 is a deficient number, since it is larger than the sum of its proper divisors (1).

209065001 is an equidigital number, since it uses as much as digits as its factorization.

209065001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 209065001 is about 14459.0802266258. The cubic root of 209065001 is about 593.5087302506.

The spelling of 209065001 in words is "two hundred nine million, sixty-five thousand, one".