33081809 has 2 divisors, whose sum is σ = 33081810. Its totient is φ = 33081808.

The previous prime is 33081799. The next prime is 33081859. The reversal of 33081809 is 90818033.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30747025 + 2334784 = 5545^2 + 1528^2 .

It is a cyclic number.

It is not a de Polignac number, because 33081809 - 2⁸ = 33081553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (33081859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16540904 + 16540905.

It is an arithmetic number, because the mean of its divisors is an integer number (16540905).

Almost surely, 2^33081809 is an apocalyptic number.

It is an amenable number.

33081809 is a deficient number, since it is larger than the sum of its proper divisors (1).

33081809 is an equidigital number, since it uses as much as digits as its factorization.

33081809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 33081809 is about 5751.6787984031. The cubic root of 33081809 is about 321.0182700043.

The spelling of 33081809 in words is "thirty-three million, eighty-one thousand, eight hundred nine".