33009931 has 4 divisors (see below), whose sum is σ = 33336864. Its totient is φ = 32683000.

The previous prime is 33009929. The next prime is 33009941. The reversal of 33009931 is 13990033.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 33009931 - 2¹ = 33009929 is a prime.

It is a super-2 number, since 2×33009931² = 2179311089249522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33009931.

It is not an unprimeable number, because it can be changed into a prime (33009901) 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, 163315 + ... + 163516.

It is an arithmetic number, because the mean of its divisors is an integer number (8334216).

Almost surely, 2^33009931 is an apocalyptic number.

33009931 is a deficient number, since it is larger than the sum of its proper divisors (326933).

33009931 is a wasteful number, since it uses less digits than its factorization.

33009931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326932.

The product of its (nonzero) digits is 2187, while the sum is 28.

The square root of 33009931 is about 5745.4269641168. The cubic root of 33009931 is about 320.7856055537.

Adding to 33009931 its reverse (13990033), we get a palindrome (46999964).

It can be divided in two parts, 3300 and 9931, that added together give a palindrome (13231).

The spelling of 33009931 in words is "thirty-three million, nine thousand, nine hundred thirty-one".