133771009 has 2 divisors, whose sum is σ = 133771010. Its totient is φ = 133771008.

The previous prime is 133770991. The next prime is 133771031. The reversal of 133771009 is 900177331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123143409 + 10627600 = 11097^2 + 3260^2 .

It is an emirp because it is prime and its reverse (900177331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 133771009 - 2²⁵ = 100216577 is a prime.

It is not a weakly prime, because it can be changed into another prime (133777009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66885504 + 66885505.

It is an arithmetic number, because the mean of its divisors is an integer number (66885505).

Almost surely, 2^133771009 is an apocalyptic number.

It is an amenable number.

133771009 is a deficient number, since it is larger than the sum of its proper divisors (1).

133771009 is an equidigital number, since it uses as much as digits as its factorization.

133771009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3969, while the sum is 31.

The square root of 133771009 is about 11565.9417688315. The cubic root of 133771009 is about 511.4313360522.

The spelling of 133771009 in words is "one hundred thirty-three million, seven hundred seventy-one thousand, nine".