131232321 has 12 divisors (see below), whose sum is σ = 206790480. Its totient is φ = 79534680.

The previous prime is 131232317. The next prime is 131232329. The reversal of 131232321 is 123232131.

131232321 is a `hidden beast` number, since 1 + 312 + 32 + 321 = 666.

It is not a de Polignac number, because 131232321 - 2² = 131232317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131232294 and 131232303.

It is not an unprimeable number, because it can be changed into a prime (131232329) 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 11 ways as a sum of consecutive naturals, for example, 662691 + ... + 662888.

It is an arithmetic number, because the mean of its divisors is an integer number (17232540).

Almost surely, 2^131232321 is an apocalyptic number.

131232321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

131232321 is a deficient number, since it is larger than the sum of its proper divisors (75558159).

131232321 is a wasteful number, since it uses less digits than its factorization.

131232321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1325596 (or 1325593 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 131232321 is about 11455.6676365893. The cubic root of 131232321 is about 508.1753597686.

Adding to 131232321 its reverse (123232131), we get a palindrome (254464452).

It can be divided in two parts, 1312 and 32321, that added together give a palindrome (33633).

The spelling of 131232321 in words is "one hundred thirty-one million, two hundred thirty-two thousand, three hundred twenty-one".