133144809 has 24 divisors (see below), whose sum is σ = 209435328. Its totient is φ = 75005280.

The previous prime is 133144793. The next prime is 133144811. The reversal of 133144809 is 908441331.

It is not a de Polignac number, because 133144809 - 2⁴ = 133144793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133144809.

It is not an unprimeable number, because it can be changed into a prime (133144859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4059 + ... + 16815.

It is an arithmetic number, because the mean of its divisors is an integer number (8726472).

Almost surely, 2^133144809 is an apocalyptic number.

It is an amenable number.

133144809 is a deficient number, since it is larger than the sum of its proper divisors (76290519).

133144809 is a wasteful number, since it uses less digits than its factorization.

133144809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12845 (or 12838 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 133144809 is about 11538.8391530517. The cubic root of 133144809 is about 510.6320613995.

The spelling of 133144809 in words is "one hundred thirty-three million, one hundred forty-four thousand, eight hundred nine".