133218929 has 2 divisors, whose sum is σ = 133218930. Its totient is φ = 133218928.

The previous prime is 133218923. The next prime is 133218947. The reversal of 133218929 is 929812331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121330225 + 11888704 = 11015^2 + 3448^2 .

It is a cyclic number.

It is not a de Polignac number, because 133218929 - 2⁴ = 133218913 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 133218892 and 133218901.

It is not a weakly prime, because it can be changed into another prime (133218923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66609464 + 66609465.

It is an arithmetic number, because the mean of its divisors is an integer number (66609465).

Almost surely, 2^133218929 is an apocalyptic number.

It is an amenable number.

133218929 is a deficient number, since it is larger than the sum of its proper divisors (1).

133218929 is an equidigital number, since it uses as much as digits as its factorization.

133218929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 133218929 is about 11542.0504677462. The cubic root of 133218929 is about 510.7267979190.

The spelling of 133218929 in words is "one hundred thirty-three million, two hundred eighteen thousand, nine hundred twenty-nine".