131981323 has 4 divisors (see below), whose sum is σ = 132195160. Its totient is φ = 131767488.

The previous prime is 131981309. The next prime is 131981327. The reversal of 131981323 is 323189131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 323189131 = 15923 ⋅20297.

It is a cyclic number.

It is not a de Polignac number, because 131981323 - 2⁹ = 131980811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131981327) 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, 105990 + ... + 107227.

It is an arithmetic number, because the mean of its divisors is an integer number (33048790).

Almost surely, 2^131981323 is an apocalyptic number.

131981323 is a deficient number, since it is larger than the sum of its proper divisors (213837).

131981323 is an equidigital number, since it uses as much as digits as its factorization.

131981323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213836.

The product of its digits is 3888, while the sum is 31.

The square root of 131981323 is about 11488.3124522273. The cubic root of 131981323 is about 509.1403215345.

The spelling of 131981323 in words is "one hundred thirty-one million, nine hundred eighty-one thousand, three hundred twenty-three".