133549621 has 2 divisors, whose sum is σ = 133549622. Its totient is φ = 133549620.

The previous prime is 133549561. The next prime is 133549639. The reversal of 133549621 is 126945331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73719396 + 59830225 = 8586^2 + 7735^2 .

It is a cyclic number.

It is not a de Polignac number, because 133549621 - 2¹¹ = 133547573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133549721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66774810 + 66774811.

It is an arithmetic number, because the mean of its divisors is an integer number (66774811).

Almost surely, 2^133549621 is an apocalyptic number.

It is an amenable number.

133549621 is a deficient number, since it is larger than the sum of its proper divisors (1).

133549621 is an equidigital number, since it uses as much as digits as its factorization.

133549621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 133549621 is about 11556.3671194714. The cubic root of 133549621 is about 511.1490444943.

The spelling of 133549621 in words is "one hundred thirty-three million, five hundred forty-nine thousand, six hundred twenty-one".