209948479387 has 2 divisors, whose sum is σ = 209948479388. Its totient is φ = 209948479386.

The previous prime is 209948479369. The next prime is 209948479393. The reversal of 209948479387 is 783974849902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209948479387 - 2¹¹ = 209948477339 is a prime.

It is not a weakly prime, because it can be changed into another prime (209948479327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104974239693 + 104974239694.

It is an arithmetic number, because the mean of its divisors is an integer number (104974239694).

Almost surely, 2^209948479387 is an apocalyptic number.

209948479387 is a deficient number, since it is larger than the sum of its proper divisors (1).

209948479387 is an equidigital number, since it uses as much as digits as its factorization.

209948479387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 219469824, while the sum is 70.

The spelling of 209948479387 in words is "two hundred nine billion, nine hundred forty-eight million, four hundred seventy-nine thousand, three hundred eighty-seven".