131032209 has 64 divisors (see below), whose sum is σ = 234842112. Its totient is φ = 62899200.

The previous prime is 131032199. The next prime is 131032211. The reversal of 131032209 is 902230131.

It is a happy number.

It is not a de Polignac number, because 131032209 - 2⁵ = 131032177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (131032259) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 239274 + ... + 239820.

It is an arithmetic number, because the mean of its divisors is an integer number (3669408).

Almost surely, 2^131032209 is an apocalyptic number.

It is an amenable number.

131032209 is a deficient number, since it is larger than the sum of its proper divisors (103809903).

131032209 is a wasteful number, since it uses less digits than its factorization.

131032209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 131032209 is about 11446.9301124799. The cubic root of 131032209 is about 507.9169282085.

The spelling of 131032209 in words is "one hundred thirty-one million, thirty-two thousand, two hundred nine".