233491 has 4 divisors (see below), whose sum is σ = 245800. Its totient is φ = 221184.

The previous prime is 233489. The next prime is 233509. The reversal of 233491 is 194332.

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

It is a 13-Lehmer number, since φ(233491) divides (233491-1)¹³.

It is a cyclic number.

It is not a de Polignac number, because 233491 - 2¹ = 233489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (233591) 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, 6126 + ... + 6163.

It is an arithmetic number, because the mean of its divisors is an integer number (61450).

2²³³⁴⁹¹ is an apocalyptic number.

233491 is a deficient number, since it is larger than the sum of its proper divisors (12309).

233491 is a wasteful number, since it uses less digits than its factorization.

233491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12308.

The product of its digits is 648, while the sum is 22.

The square root of 233491 is about 483.2090644845. The cubic root of 233491 is about 61.5776884115.

The spelling of 233491 in words is "two hundred thirty-three thousand, four hundred ninety-one".