33205981 has 8 divisors (see below), whose sum is σ = 35225280. Its totient is φ = 31194048.

The previous prime is 33205979. The next prime is 33205993. The reversal of 33205981 is 18950233.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 33205981 - 2¹ = 33205979 is a prime.

It is a super-3 number, since 3×33205981³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33205961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9490 + ... + 12508.

It is an arithmetic number, because the mean of its divisors is an integer number (4403160).

Almost surely, 2^33205981 is an apocalyptic number.

It is an amenable number.

33205981 is a deficient number, since it is larger than the sum of its proper divisors (2019299).

33205981 is a wasteful number, since it uses less digits than its factorization.

33205981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 33205981 is about 5762.4631018341. The cubic root of 33205981 is about 321.4194140413.

The spelling of 33205981 in words is "thirty-three million, two hundred five thousand, nine hundred eighty-one".