131109321 has 32 divisors (see below), whose sum is σ = 212509440. Its totient is φ = 70189056.

The previous prime is 131109299. The next prime is 131109331. The reversal of 131109321 is 123901131.

It is not a de Polignac number, because 131109321 - 2⁵ = 131109289 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131109331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91035 + ... + 92463.

It is an arithmetic number, because the mean of its divisors is an integer number (6640920).

Almost surely, 2^131109321 is an apocalyptic number.

It is an amenable number.

131109321 is a deficient number, since it is larger than the sum of its proper divisors (81400119).

131109321 is a wasteful number, since it uses less digits than its factorization.

131109321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 131109321 is about 11450.2978563878. The cubic root of 131109321 is about 508.0165444526.

The spelling of 131109321 in words is "one hundred thirty-one million, one hundred nine thousand, three hundred twenty-one".