33081813 has 24 divisors (see below), whose sum is σ = 50813568. Its totient is φ = 20668032.

The previous prime is 33081809. The next prime is 33081859. The reversal of 33081813 is 31818033.

It is not a de Polignac number, because 33081813 - 2² = 33081809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33081863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70606 + ... + 71072.

It is an arithmetic number, because the mean of its divisors is an integer number (2117232).

Almost surely, 2^33081813 is an apocalyptic number.

It is an amenable number.

33081813 is a deficient number, since it is larger than the sum of its proper divisors (17731755).

33081813 is a wasteful number, since it uses less digits than its factorization.

33081813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 953 (or 950 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 33081813 is about 5751.6791461277. The cubic root of 33081813 is about 321.0182829427.

Adding to 33081813 its reverse (31818033), we get a palindrome (64899846).

The spelling of 33081813 in words is "thirty-three million, eighty-one thousand, eight hundred thirteen".