209131149 has 4 divisors (see below), whose sum is σ = 278841536. Its totient is φ = 139420764.

The previous prime is 209131129. The next prime is 209131183. The reversal of 209131149 is 941131902.

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 209131149 - 2¹³ = 209122957 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 (209131129) 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, 34855189 + ... + 34855194.

It is an arithmetic number, because the mean of its divisors is an integer number (69710384).

Almost surely, 2^209131149 is an apocalyptic number.

It is an amenable number.

209131149 is a deficient number, since it is larger than the sum of its proper divisors (69710387).

209131149 is an equidigital number, since it uses as much as digits as its factorization.

209131149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69710386.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 209131149 is about 14461.3674664604. The cubic root of 209131149 is about 593.5713188801.

The spelling of 209131149 in words is "two hundred nine million, one hundred thirty-one thousand, one hundred forty-nine".