133881841 has 4 divisors (see below), whose sum is σ = 134482432. Its totient is φ = 133281252.

The previous prime is 133881829. The next prime is 133881857. The reversal of 133881841 is 148188331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 148188331 = 1319 ⋅112349.

It is a cyclic number.

It is not a de Polignac number, because 133881841 - 2¹⁵ = 133849073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133881841.

It is not an unprimeable number, because it can be changed into a prime (133881871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 299961 + ... + 300406.

It is an arithmetic number, because the mean of its divisors is an integer number (33620608).

Almost surely, 2^133881841 is an apocalyptic number.

It is an amenable number.

133881841 is a deficient number, since it is larger than the sum of its proper divisors (600591).

133881841 is an equidigital number, since it uses as much as digits as its factorization.

133881841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600590.

The product of its digits is 18432, while the sum is 37.

The square root of 133881841 is about 11570.7320857412. The cubic root of 133881841 is about 511.5725408149.

The spelling of 133881841 in words is "one hundred thirty-three million, eight hundred eighty-one thousand, eight hundred forty-one".