209201087 has 4 divisors (see below), whose sum is σ = 210533736. Its totient is φ = 207868440.

The previous prime is 209201029. The next prime is 209201093. The reversal of 209201087 is 780102902.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 209201087 - 2¹² = 209196991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209201387) 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, 666089 + ... + 666402.

It is an arithmetic number, because the mean of its divisors is an integer number (52633434).

Almost surely, 2^209201087 is an apocalyptic number.

209201087 is a deficient number, since it is larger than the sum of its proper divisors (1332649).

209201087 is a wasteful number, since it uses less digits than its factorization.

209201087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332648.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 209201087 is about 14463.7853620689. The cubic root of 209201087 is about 593.6374792206.

Adding to 209201087 its reverse (780102902), we get a palindrome (989303989).

The spelling of 209201087 in words is "two hundred nine million, two hundred one thousand, eighty-seven".