133406309 has 2 divisors, whose sum is σ = 133406310. Its totient is φ = 133406308.

The previous prime is 133406291. The next prime is 133406359. The reversal of 133406309 is 903604331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93993025 + 39413284 = 9695^2 + 6278^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133406309 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 (133406359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66703154 + 66703155.

It is an arithmetic number, because the mean of its divisors is an integer number (66703155).

Almost surely, 2^133406309 is an apocalyptic number.

It is an amenable number.

133406309 is a deficient number, since it is larger than the sum of its proper divisors (1).

133406309 is an equidigital number, since it uses as much as digits as its factorization.

133406309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 29.

The square root of 133406309 is about 11550.1648905979. The cubic root of 133406309 is about 510.9661411665.

The spelling of 133406309 in words is "one hundred thirty-three million, four hundred six thousand, three hundred nine".