209801126 has 4 divisors (see below), whose sum is σ = 314701692. Its totient is φ = 104900562.

The previous prime is 209801093. The next prime is 209801153. The reversal of 209801126 is 621108902.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52450280 + ... + 52450283.

It is an arithmetic number, because the mean of its divisors is an integer number (78675423).

Almost surely, 2^209801126 is an apocalyptic number.

209801126 is a deficient number, since it is larger than the sum of its proper divisors (104900566).

209801126 is a wasteful number, since it uses less digits than its factorization.

209801126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104900565.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 209801126 is about 14484.5133159523. The cubic root of 209801126 is about 594.2045024374.

The spelling of 209801126 in words is "two hundred nine million, eight hundred one thousand, one hundred twenty-six".