209691122 has 8 divisors (see below), whose sum is σ = 318518400. Its totient is φ = 103518324.

The previous prime is 209691121. The next prime is 209691169. The reversal of 209691122 is 221196902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (209691121) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 663422 + ... + 663737.

It is an arithmetic number, because the mean of its divisors is an integer number (39814800).

Almost surely, 2^209691122 is an apocalyptic number.

209691122 is a deficient number, since it is larger than the sum of its proper divisors (108827278).

209691122 is a wasteful number, since it uses less digits than its factorization.

209691122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327240.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 209691122 is about 14480.7155209955. The cubic root of 209691122 is about 594.1006321662.

The spelling of 209691122 in words is "two hundred nine million, six hundred ninety-one thousand, one hundred twenty-two".