335991 has 4 divisors (see below), whose sum is σ = 447992. Its totient is φ = 223992.

The previous prime is 335957. The next prime is 335999. The reversal of 335991 is 199533.

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

It is not a de Polignac number, because 335991 - 2¹³ = 327799 is a prime.

It is a super-2 number, since 2×335991² = 225779904162, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

335991 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (335999) 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, 55996 + ... + 56001.

It is an arithmetic number, because the mean of its divisors is an integer number (111998).

2³³⁵⁹⁹¹ is an apocalyptic number.

335991 is a deficient number, since it is larger than the sum of its proper divisors (112001).

335991 is a wasteful number, since it uses less digits than its factorization.

335991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112000.

The product of its digits is 3645, while the sum is 30.

The square root of 335991 is about 579.6473065580. The cubic root of 335991 is about 69.5199121731.

It can be divided in two parts, 335 and 991, that added together give a triangular number (1326 = T₅₁).

The spelling of 335991 in words is "three hundred thirty-five thousand, nine hundred ninety-one".