33231409 has 2 divisors, whose sum is σ = 33231410. Its totient is φ = 33231408.

The previous prime is 33231403. The next prime is 33231433. The reversal of 33231409 is 90413233.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31192225 + 2039184 = 5585^2 + 1428^2 .

It is an emirp because it is prime and its reverse (90413233) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33231409 - 2⁵ = 33231377 is a prime.

It is a super-2 number, since 2×33231409² = 2208653088250562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (33231403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16615704 + 16615705.

It is an arithmetic number, because the mean of its divisors is an integer number (16615705).

Almost surely, 2^33231409 is an apocalyptic number.

It is an amenable number.

33231409 is a deficient number, since it is larger than the sum of its proper divisors (1).

33231409 is an equidigital number, since it uses as much as digits as its factorization.

33231409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 25.

The square root of 33231409 is about 5764.6690277934. The cubic root of 33231409 is about 321.5014370914.

The spelling of 33231409 in words is "thirty-three million, two hundred thirty-one thousand, four hundred nine".