133671729 has 8 divisors (see below), whose sum is σ = 178342560. Its totient is φ = 89057696.

The previous prime is 133671689. The next prime is 133671739. The reversal of 133671729 is 927176331.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 133671729 - 2⁹ = 133671217 is a prime.

It is a super-2 number, since 2×133671729² = 35736262267698882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133671739) 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, 8364 + ... + 18365.

It is an arithmetic number, because the mean of its divisors is an integer number (22292820).

Almost surely, 2^133671729 is an apocalyptic number.

It is an amenable number.

133671729 is a deficient number, since it is larger than the sum of its proper divisors (44670831).

133671729 is a wasteful number, since it uses less digits than its factorization.

133671729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28399.

The product of its digits is 47628, while the sum is 39.

The square root of 133671729 is about 11561.6490605796. The cubic root of 133671729 is about 511.3047827985.

The spelling of 133671729 in words is "one hundred thirty-three million, six hundred seventy-one thousand, seven hundred twenty-nine".