133688129 has 8 divisors (see below), whose sum is σ = 135350592. Its totient is φ = 132032880.

The previous prime is 133688117. The next prime is 133688143. The reversal of 133688129 is 921886331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133688129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133688179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41822 + ... + 44904.

It is an arithmetic number, because the mean of its divisors is an integer number (16918824).

Almost surely, 2^133688129 is an apocalyptic number.

It is an amenable number.

133688129 is a deficient number, since it is larger than the sum of its proper divisors (1662463).

133688129 is a wasteful number, since it uses less digits than its factorization.

133688129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3607.

The product of its digits is 62208, while the sum is 41.

The square root of 133688129 is about 11562.3582802126. The cubic root of 133688129 is about 511.3256923695.

The spelling of 133688129 in words is "one hundred thirty-three million, six hundred eighty-eight thousand, one hundred twenty-nine".