133425609 has 16 divisors (see below), whose sum is σ = 183632640. Its totient is φ = 86130000.

The previous prime is 133425587. The next prime is 133425613. The reversal of 133425609 is 906524331.

133425609 = 136² + 137² + ... + 738².

It is not a de Polignac number, because 133425609 - 2¹¹ = 133423561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 133425609.

It is not an unprimeable number, because it can be changed into a prime (133425629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6234 + ... + 17484.

It is an arithmetic number, because the mean of its divisors is an integer number (11477040).

Almost surely, 2^133425609 is an apocalyptic number.

It is an amenable number.

133425609 is a deficient number, since it is larger than the sum of its proper divisors (50207031).

133425609 is a wasteful number, since it uses less digits than its factorization.

133425609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11380.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 133425609 is about 11551.0003462904. Note that the first 3 decimals coincide. The cubic root of 133425609 is about 510.9907806084.

The spelling of 133425609 in words is "one hundred thirty-three million, four hundred twenty-five thousand, six hundred nine".