209351149 has 16 divisors (see below), whose sum is σ = 243008640. Its totient is φ = 176647680.

The previous prime is 209351119. The next prime is 209351159. The reversal of 209351149 is 941153902.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209351149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209351119) 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 15 ways as a sum of consecutive naturals, for example, 237189 + ... + 238069.

It is an arithmetic number, because the mean of its divisors is an integer number (15188040).

Almost surely, 2^209351149 is an apocalyptic number.

It is an amenable number.

209351149 is a deficient number, since it is larger than the sum of its proper divisors (33657491).

209351149 is an equidigital number, since it uses as much as digits as its factorization.

209351149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 209351149 is about 14468.9719399825. The cubic root of 209351149 is about 593.7793859657.

The spelling of 209351149 in words is "two hundred nine million, three hundred fifty-one thousand, one hundred forty-nine".