209996513 has 2 divisors, whose sum is σ = 209996514. Its totient is φ = 209996512.

The previous prime is 209996491. The next prime is 209996533. The reversal of 209996513 is 315699902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206870689 + 3125824 = 14383^2 + 1768^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209996513 is a prime.

It is not a weakly prime, because it can be changed into another prime (209996533) 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, 104998256 + 104998257.

It is an arithmetic number, because the mean of its divisors is an integer number (104998257).

Almost surely, 2^209996513 is an apocalyptic number.

It is an amenable number.

209996513 is a deficient number, since it is larger than the sum of its proper divisors (1).

209996513 is an equidigital number, since it uses as much as digits as its factorization.

209996513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 209996513 is about 14491.2564327597. The cubic root of 209996513 is about 594.3889053445.

The spelling of 209996513 in words is "two hundred nine million, nine hundred ninety-six thousand, five hundred thirteen".