209191146 has 16 divisors (see below), whose sum is σ = 422445504. Its totient is φ = 69053184.

The previous prime is 209191139. The next prime is 209191163. The reversal of 209191146 is 641191902.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 168631 + ... + 169866.

It is an arithmetic number, because the mean of its divisors is an integer number (26402844).

Almost surely, 2^209191146 is an apocalyptic number.

209191146 is an abundant number, since it is smaller than the sum of its proper divisors (213254358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209191146 is a wasteful number, since it uses less digits than its factorization.

209191146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338605.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 209191146 is about 14463.4417065925. The cubic root of 209191146 is about 593.6280760769.

The spelling of 209191146 in words is "two hundred nine million, one hundred ninety-one thousand, one hundred forty-six".