133408213 has 2 divisors, whose sum is σ = 133408214. Its totient is φ = 133408212.

The previous prime is 133408183. The next prime is 133408217. The reversal of 133408213 is 312804331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102070609 + 31337604 = 10103^2 + 5598^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133408213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133408217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66704106 + 66704107.

It is an arithmetic number, because the mean of its divisors is an integer number (66704107).

Almost surely, 2^133408213 is an apocalyptic number.

It is an amenable number.

133408213 is a deficient number, since it is larger than the sum of its proper divisors (1).

133408213 is an equidigital number, since it uses as much as digits as its factorization.

133408213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 133408213 is about 11550.2473133695. The cubic root of 133408213 is about 510.9685720233.

The spelling of 133408213 in words is "one hundred thirty-three million, four hundred eight thousand, two hundred thirteen".