131433221 has 2 divisors, whose sum is σ = 131433222. Its totient is φ = 131433220.

The previous prime is 131433209. The next prime is 131433233. The reversal of 131433221 is 122334131.

It is a balanced prime because it is at equal distance from previous prime (131433209) and next prime (131433233).

It can be written as a sum of positive squares in only one way, i.e., 120450625 + 10982596 = 10975^2 + 3314^2 .

It is an emirp because it is prime and its reverse (122334131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131433221 - 2¹⁴ = 131416837 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 131433193 and 131433202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131433251) 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 as a sum of consecutive naturals, namely, 65716610 + 65716611.

It is an arithmetic number, because the mean of its divisors is an integer number (65716611).

Almost surely, 2^131433221 is an apocalyptic number.

It is an amenable number.

131433221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131433221 is an equidigital number, since it uses as much as digits as its factorization.

131433221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 20.

The square root of 131433221 is about 11464.4328686595. The cubic root of 131433221 is about 508.4345448444.

Adding to 131433221 its reverse (122334131), we get a palindrome (253767352).

The spelling of 131433221 in words is "one hundred thirty-one million, four hundred thirty-three thousand, two hundred twenty-one".