133811481 has 16 divisors (see below), whose sum is σ = 184973760. Its totient is φ = 85942080.

The previous prime is 133811479. The next prime is 133811497. The reversal of 133811481 is 184118331.

It is not a de Polignac number, because 133811481 - 2¹ = 133811479 is a prime.

It is a super-2 number, since 2×133811481² = 35811024894826722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (133811441) 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, 45646 + ... + 48488.

It is an arithmetic number, because the mean of its divisors is an integer number (11560860).

Almost surely, 2^133811481 is an apocalyptic number.

It is an amenable number.

133811481 is a deficient number, since it is larger than the sum of its proper divisors (51162279).

133811481 is a wasteful number, since it uses less digits than its factorization.

133811481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3416.

The product of its digits is 2304, while the sum is 30.

The square root of 133811481 is about 11567.6912562533. The cubic root of 133811481 is about 511.4829081682.

The spelling of 133811481 in words is "one hundred thirty-three million, eight hundred eleven thousand, four hundred eighty-one".