133381873 has 4 divisors (see below), whose sum is σ = 133405668. Its totient is φ = 133358080.

The previous prime is 133381819. The next prime is 133381879. The reversal of 133381873 is 378183331.

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

It can be written as a sum of positive squares in 2 ways, for example, as 109244304 + 24137569 = 10452^2 + 4913^2 .

It is a cyclic number.

It is not a de Polignac number, because 133381873 - 2⁹ = 133381361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133381879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1665 + ... + 16417.

It is an arithmetic number, because the mean of its divisors is an integer number (33351417).

Almost surely, 2^133381873 is an apocalyptic number.

It is an amenable number.

133381873 is a deficient number, since it is larger than the sum of its proper divisors (23795).

133381873 is an equidigital number, since it uses as much as digits as its factorization.

133381873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23794.

The product of its digits is 36288, while the sum is 37.

The square root of 133381873 is about 11549.1070217571. The cubic root of 133381873 is about 510.9349414150.

The spelling of 133381873 in words is "one hundred thirty-three million, three hundred eighty-one thousand, eight hundred seventy-three".