133281573 has 16 divisors (see below), whose sum is σ = 185936256. Its totient is φ = 84761600.

The previous prime is 133281563. The next prime is 133281583. The reversal of 133281573 is 375182331.

It is an interprime number because it is at equal distance from previous prime (133281563) and next prime (133281583).

It is a cyclic number.

It is not a de Polignac number, because 133281573 - 2⁵ = 133281541 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133281503) 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 15 ways as a sum of consecutive naturals, for example, 25261 + ... + 30077.

It is an arithmetic number, because the mean of its divisors is an integer number (11621016).

Almost surely, 2^133281573 is an apocalyptic number.

It is an amenable number.

133281573 is a deficient number, since it is larger than the sum of its proper divisors (52654683).

133281573 is a wasteful number, since it uses less digits than its factorization.

133281573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5244.

The product of its digits is 15120, while the sum is 33.

The square root of 133281573 is about 11544.7638780531. The cubic root of 133281573 is about 510.8068389867.

The spelling of 133281573 in words is "one hundred thirty-three million, two hundred eighty-one thousand, five hundred seventy-three".