33481681 has 4 divisors (see below), whose sum is σ = 33504100. Its totient is φ = 33459264.

The previous prime is 33481627. The next prime is 33481729. The reversal of 33481681 is 18618433.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18618433 = 173 ⋅107621.

It can be written as a sum of positive squares in 2 ways, for example, as 22886656 + 10595025 = 4784^2 + 3255^2 .

It is a cyclic number.

It is not a de Polignac number, because 33481681 - 2²³ = 25093073 is a prime.

It is a super-2 number, since 2×33481681² = 2242045925171522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33481081) 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, 8796 + ... + 12013.

It is an arithmetic number, because the mean of its divisors is an integer number (8376025).

Almost surely, 2^33481681 is an apocalyptic number.

It is an amenable number.

33481681 is a deficient number, since it is larger than the sum of its proper divisors (22419).

33481681 is a wasteful number, since it uses less digits than its factorization.

33481681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22418.

The product of its digits is 13824, while the sum is 34.

The square root of 33481681 is about 5786.3357144224. The cubic root of 33481681 is about 322.3065153540.

The spelling of 33481681 in words is "thirty-three million, four hundred eighty-one thousand, six hundred eighty-one".