131835209 has 4 divisors (see below), whose sum is σ = 143820240. Its totient is φ = 119850180.

The previous prime is 131835203. The next prime is 131835227. The reversal of 131835209 is 902538131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 902538131 = 11 ⋅82048921.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131835209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131835203) 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, 5992499 + ... + 5992520.

It is an arithmetic number, because the mean of its divisors is an integer number (35955060).

Almost surely, 2^131835209 is an apocalyptic number.

It is an amenable number.

131835209 is a deficient number, since it is larger than the sum of its proper divisors (11985031).

131835209 is a wasteful number, since it uses less digits than its factorization.

131835209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11985030.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 131835209 is about 11481.9514456385. The cubic root of 131835209 is about 508.9523656505.

The spelling of 131835209 in words is "one hundred thirty-one million, eight hundred thirty-five thousand, two hundred nine".