33121609 has 4 divisors (see below), whose sum is σ = 34190080. Its totient is φ = 32053140.

The previous prime is 33121591. The next prime is 33121639. The reversal of 33121609 is 90612133.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90612133 = 4159 ⋅21787.

It is a cyclic number.

It is not a de Polignac number, because 33121609 - 2⁹ = 33121097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33121639) 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, 534189 + ... + 534250.

It is an arithmetic number, because the mean of its divisors is an integer number (8547520).

Almost surely, 2^33121609 is an apocalyptic number.

It is an amenable number.

33121609 is a deficient number, since it is larger than the sum of its proper divisors (1068471).

33121609 is a wasteful number, since it uses less digits than its factorization.

33121609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1068470.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 33121609 is about 5755.1376178159. The cubic root of 33121609 is about 321.1469550958.

The spelling of 33121609 in words is "thirty-three million, one hundred twenty-one thousand, six hundred nine".