209198901 has 4 divisors (see below), whose sum is σ = 278931872. Its totient is φ = 139465932.

The previous prime is 209198867. The next prime is 209198903. The reversal of 209198901 is 109891902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 209198901 - 2⁹ = 209198389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209198901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209198903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34866481 + ... + 34866486.

It is an arithmetic number, because the mean of its divisors is an integer number (69732968).

Almost surely, 2^209198901 is an apocalyptic number.

It is an amenable number.

209198901 is a deficient number, since it is larger than the sum of its proper divisors (69732971).

209198901 is an equidigital number, since it uses as much as digits as its factorization.

209198901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69732970.

The product of its (nonzero) digits is 11664, while the sum is 39.

The square root of 209198901 is about 14463.7097938254. The cubic root of 209198901 is about 593.6354115194.

The spelling of 209198901 in words is "two hundred nine million, one hundred ninety-eight thousand, nine hundred one".