133928771 has 4 divisors (see below), whose sum is σ = 141806952. Its totient is φ = 126050592.

The previous prime is 133928759. The next prime is 133928813. The reversal of 133928771 is 177829331.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133928771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133928071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3939065 + ... + 3939098.

It is an arithmetic number, because the mean of its divisors is an integer number (35451738).

Almost surely, 2^133928771 is an apocalyptic number.

133928771 is a deficient number, since it is larger than the sum of its proper divisors (7878181).

133928771 is an equidigital number, since it uses as much as digits as its factorization.

133928771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7878180.

The product of its digits is 63504, while the sum is 41.

The square root of 133928771 is about 11572.7598696249. The cubic root of 133928771 is about 511.6323081801.

The spelling of 133928771 in words is "one hundred thirty-three million, nine hundred twenty-eight thousand, seven hundred seventy-one".