133491065 has 4 divisors (see below), whose sum is σ = 160189284. Its totient is φ = 106792848.

The previous prime is 133491041. The next prime is 133491091. The reversal of 133491065 is 560194331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 560194331 = 71 ⋅7890061.

It can be written as a sum of positive squares in 2 ways, for example, as 106419856 + 27071209 = 10316^2 + 5203^2 .

It is a cyclic number.

It is not a de Polignac number, because 133491065 - 2¹⁰ = 133490041 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13349102 + ... + 13349111.

It is an arithmetic number, because the mean of its divisors is an integer number (40047321).

Almost surely, 2^133491065 is an apocalyptic number.

It is an amenable number.

133491065 is a deficient number, since it is larger than the sum of its proper divisors (26698219).

133491065 is an equidigital number, since it uses as much as digits as its factorization.

133491065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26698218.

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 133491065 is about 11553.8333465565. The cubic root of 133491065 is about 511.0743276494.

The spelling of 133491065 in words is "one hundred thirty-three million, four hundred ninety-one thousand, sixty-five".