134591209 has 2 divisors, whose sum is σ = 134591210. Its totient is φ = 134591208.

The previous prime is 134591183. The next prime is 134591257. The reversal of 134591209 is 902195431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91623184 + 42968025 = 9572^2 + 6555^2 .

It is a cyclic number.

It is not a de Polignac number, because 134591209 - 2⁷ = 134591081 is a prime.

It is a super-2 number, since 2×134591209² = 36229587080163362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (134591279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67295604 + 67295605.

It is an arithmetic number, because the mean of its divisors is an integer number (67295605).

Almost surely, 2^134591209 is an apocalyptic number.

It is an amenable number.

134591209 is a deficient number, since it is larger than the sum of its proper divisors (1).

134591209 is an equidigital number, since it uses as much as digits as its factorization.

134591209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 134591209 is about 11601.3451375261. The cubic root of 134591209 is about 512.4744658308.

The spelling of 134591209 in words is "one hundred thirty-four million, five hundred ninety-one thousand, two hundred nine".