133426409 has 2 divisors, whose sum is σ = 133426410. Its totient is φ = 133426408.

The previous prime is 133426393. The next prime is 133426411. The reversal of 133426409 is 904624331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105124009 + 28302400 = 10253^2 + 5320^2 .

It is a cyclic number.

It is not a de Polignac number, because 133426409 - 2⁴ = 133426393 is a prime.

Together with 133426411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (133426429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66713204 + 66713205.

It is an arithmetic number, because the mean of its divisors is an integer number (66713205).

Almost surely, 2^133426409 is an apocalyptic number.

It is an amenable number.

133426409 is a deficient number, since it is larger than the sum of its proper divisors (1).

133426409 is an equidigital number, since it uses as much as digits as its factorization.

133426409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 133426409 is about 11551.0349752739. The cubic root of 133426409 is about 510.9918018811.

The spelling of 133426409 in words is "one hundred thirty-three million, four hundred twenty-six thousand, four hundred nine".