133749809 has 2 divisors, whose sum is σ = 133749810. Its totient is φ = 133749808.

The previous prime is 133749773. The next prime is 133749859. The reversal of 133749809 is 908947331.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130599184 + 3150625 = 11428^2 + 1775^2 .

It is a cyclic number.

It is not a de Polignac number, because 133749809 - 2²⁴ = 116972593 is a prime.

It is a super-2 number, since 2×133749809² = 35778022815072962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 133749809.

It is not a weakly prime, because it can be changed into another prime (133749859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66874904 + 66874905.

It is an arithmetic number, because the mean of its divisors is an integer number (66874905).

Almost surely, 2^133749809 is an apocalyptic number.

It is an amenable number.

133749809 is a deficient number, since it is larger than the sum of its proper divisors (1).

133749809 is an equidigital number, since it uses as much as digits as its factorization.

133749809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 133749809 is about 11565.0252485673. The cubic root of 133749809 is about 511.4043174498.

The spelling of 133749809 in words is "one hundred thirty-three million, seven hundred forty-nine thousand, eight hundred nine".