209064979 has 2 divisors, whose sum is σ = 209064980. Its totient is φ = 209064978.

The previous prime is 209064949. The next prime is 209065001. The reversal of 209064979 is 979460902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209064979 - 2¹³ = 209056787 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (209064949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104532489 + 104532490.

It is an arithmetic number, because the mean of its divisors is an integer number (104532490).

Almost surely, 2^209064979 is an apocalyptic number.

209064979 is a deficient number, since it is larger than the sum of its proper divisors (1).

209064979 is an equidigital number, since it uses as much as digits as its factorization.

209064979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 46.

The square root of 209064979 is about 14459.0794658581. The cubic root of 209064979 is about 593.5087094322.

The spelling of 209064979 in words is "two hundred nine million, sixty-four thousand, nine hundred seventy-nine".