131101321 has 4 divisors (see below), whose sum is σ = 141186052. Its totient is φ = 121016592.

The previous prime is 131101309. The next prime is 131101339. The reversal of 131101321 is 123101131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24206400 + 106894921 = 4920^2 + 10339^2 .

It is a cyclic number.

It is not a de Polignac number, because 131101321 - 2⁷ = 131101193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 10084717 = 131101321 / (1 + 3 + 1 + 1 + 0 + 1 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131101381) 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 3 ways as a sum of consecutive naturals, for example, 5042346 + ... + 5042371.

It is an arithmetic number, because the mean of its divisors is an integer number (35296513).

Almost surely, 2^131101321 is an apocalyptic number.

It is an amenable number.

131101321 is a deficient number, since it is larger than the sum of its proper divisors (10084731).

131101321 is a wasteful number, since it uses less digits than its factorization.

131101321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10084730.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 131101321 is about 11449.9485151681. The cubic root of 131101321 is about 508.0062115615.

Adding to 131101321 its reverse (123101131), we get a palindrome (254202452).

The spelling of 131101321 in words is "one hundred thirty-one million, one hundred one thousand, three hundred twenty-one".