131203321 has 4 divisors (see below), whose sum is σ = 134403444. Its totient is φ = 128003200.

The previous prime is 131203309. The next prime is 131203333. The reversal of 131203321 is 123302131.

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

It is an interprime number because it is at equal distance from previous prime (131203309) and next prime (131203333).

It can be written as a sum of positive squares in 2 ways, for example, as 8791225 + 122412096 = 2965^2 + 11064^2 .

It is a cyclic number.

It is not a de Polignac number, because 131203321 - 2¹⁹ = 130679033 is a prime.

It is a super-2 number, since 2×131203321² = 34428622882858082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131203295 and 131203304.

It is not an unprimeable number, because it can be changed into a prime (131203301) 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, 1600000 + ... + 1600081.

It is an arithmetic number, because the mean of its divisors is an integer number (33600861).

Almost surely, 2^131203321 is an apocalyptic number.

It is an amenable number.

131203321 is a deficient number, since it is larger than the sum of its proper divisors (3200123).

131203321 is an equidigital number, since it uses as much as digits as its factorization.

131203321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200122.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 131203321 is about 11454.4018176420. The cubic root of 131203321 is about 508.1379244504.

Adding to 131203321 its reverse (123302131), we get a palindrome (254505452).

The spelling of 131203321 in words is "one hundred thirty-one million, two hundred three thousand, three hundred twenty-one".