209648479 has 2 divisors, whose sum is σ = 209648480. Its totient is φ = 209648478.

The previous prime is 209648477. The next prime is 209648531. The reversal of 209648479 is 974846902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209648479 - 2¹ = 209648477 is a prime.

Together with 209648477, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209648477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104824239 + 104824240.

It is an arithmetic number, because the mean of its divisors is an integer number (104824240).

Almost surely, 2^209648479 is an apocalyptic number.

209648479 is a deficient number, since it is larger than the sum of its proper divisors (1).

209648479 is an equidigital number, since it uses as much as digits as its factorization.

209648479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 49.

The square root of 209648479 is about 14479.2430396067. The cubic root of 209648479 is about 594.0603571329.

The spelling of 209648479 in words is "two hundred nine million, six hundred forty-eight thousand, four hundred seventy-nine".