133891765 has 40 divisors (see below), whose sum is σ = 197638560. Its totient is φ = 86831136.

The previous prime is 133891757. The next prime is 133891829. The reversal of 133891765 is 567198331.

It is not a de Polignac number, because 133891765 - 2³ = 133891757 is a prime.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 227802 + ... + 228388.

It is an arithmetic number, because the mean of its divisors is an integer number (4940964).

Almost surely, 2^133891765 is an apocalyptic number.

It is an amenable number.

133891765 is a deficient number, since it is larger than the sum of its proper divisors (63746795).

133891765 is an frugal number, since it uses more digits than its factorization.

133891765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 639 (or 618 counting only the distinct ones).

The product of its digits is 136080, while the sum is 43.

The square root of 133891765 is about 11571.1609184213. The cubic root of 133891765 is about 511.5851806183.

The spelling of 133891765 in words is "one hundred thirty-three million, eight hundred ninety-one thousand, seven hundred sixty-five".