134642009 has 2 divisors, whose sum is σ = 134642010. Its totient is φ = 134642008.

The previous prime is 134641979. The next prime is 134642017. The reversal of 134642009 is 900246431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108222409 + 26419600 = 10403^2 + 5140^2 .

It is a cyclic number.

It is not a de Polignac number, because 134642009 - 2⁸ = 134641753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (134642029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67321004 + 67321005.

It is an arithmetic number, because the mean of its divisors is an integer number (67321005).

Almost surely, 2^134642009 is an apocalyptic number.

It is an amenable number.

134642009 is a deficient number, since it is larger than the sum of its proper divisors (1).

134642009 is an equidigital number, since it uses as much as digits as its factorization.

134642009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 134642009 is about 11603.5343322627. The cubic root of 134642009 is about 512.5389337069.

The spelling of 134642009 in words is "one hundred thirty-four million, six hundred forty-two thousand, nine".