209989396516 has 9 divisors (see below), whose sum is σ = 367483047771. Its totient is φ = 104994240012.

The previous prime is 209989396489. The next prime is 209989396523. The reversal of 209989396516 is 615693989902.

The square root of 209989396516 is 458246.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 801931 + ... + 1031053.

Almost surely, 2^209989396516 is an apocalyptic number.

209989396516 is the 458246-th square number.

It is an amenable number.

209989396516 is a deficient number, since it is larger than the sum of its proper divisors (157493651255).

209989396516 is an frugal number, since it uses more digits than its factorization.

209989396516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458250 (or 229125 counting only the distinct ones).

The product of its (nonzero) digits is 56687040, while the sum is 67.

The spelling of 209989396516 in words is "two hundred nine billion, nine hundred eighty-nine million, three hundred ninety-six thousand, five hundred sixteen".