33491 has 4 divisors (see below), whose sum is σ = 33912. Its totient is φ = 33072.

The previous prime is 33487. The next prime is 33493. The reversal of 33491 is 19433.

33491 is an esthetic number in base 13, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 33491 - 2² = 33487 is a prime.

It is a super-2 number, since 2×33491² = 2243294162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50 + ... + 263.

It is an arithmetic number, because the mean of its divisors is an integer number (8478).

2³³⁴⁹¹ is an apocalyptic number.

33491 is a deficient number, since it is larger than the sum of its proper divisors (421).

33491 is a wasteful number, since it uses less digits than its factorization.

33491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420.

The product of its digits is 324, while the sum is 20.

The square root of 33491 is about 183.0054643993. The cubic root of 33491 is about 32.2336415245.

The spelling of 33491 in words is "thirty-three thousand, four hundred ninety-one".