133081291 has 4 divisors (see below), whose sum is σ = 152092912. Its totient is φ = 114069672.

The previous prime is 133081237. The next prime is 133081297. The reversal of 133081291 is 192180331.

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

It is a cyclic number.

It is not a de Polignac number, because 133081291 - 2¹⁵ = 133048523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133081297) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9505800 + ... + 9505813.

It is an arithmetic number, because the mean of its divisors is an integer number (38023228).

Almost surely, 2^133081291 is an apocalyptic number.

133081291 is a deficient number, since it is larger than the sum of its proper divisors (19011621).

133081291 is an equidigital number, since it uses as much as digits as its factorization.

133081291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19011620.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 133081291 is about 11536.0864681225. The cubic root of 133081291 is about 510.5508478532.

It can be divided in two parts, 1330 and 81291, that added together give a triangular number (82621 = T₄₀₆).

The spelling of 133081291 in words is "one hundred thirty-three million, eighty-one thousand, two hundred ninety-one".