133845221 has 2 divisors, whose sum is σ = 133845222. Its totient is φ = 133845220.

The previous prime is 133845203. The next prime is 133845241. The reversal of 133845221 is 122548331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71656225 + 62188996 = 8465^2 + 7886^2 .

It is a cyclic number.

It is not a de Polignac number, because 133845221 - 2⁶ = 133845157 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133845241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66922610 + 66922611.

It is an arithmetic number, because the mean of its divisors is an integer number (66922611).

Almost surely, 2^133845221 is an apocalyptic number.

It is an amenable number.

133845221 is a deficient number, since it is larger than the sum of its proper divisors (1).

133845221 is an equidigital number, since it uses as much as digits as its factorization.

133845221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 29.

The square root of 133845221 is about 11569.1495365908. The cubic root of 133845221 is about 511.5258939741.

The spelling of 133845221 in words is "one hundred thirty-three million, eight hundred forty-five thousand, two hundred twenty-one".