33420661 has 4 divisors (see below), whose sum is σ = 33452332. Its totient is φ = 33388992.

The previous prime is 33420643. The next prime is 33420683. The reversal of 33420661 is 16602433.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16602433 = 1259 ⋅13187.

It can be written as a sum of positive squares in 2 ways, for example, as 24900100 + 8520561 = 4990^2 + 2919^2 .

It is a 3-Lehmer number, since φ(33420661) divides (33420661-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33420661 is a prime.

It is a super-2 number, since 2×33420661² = 2233881163353842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33420061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14196 + ... + 16381.

It is an arithmetic number, because the mean of its divisors is an integer number (8363083).

Almost surely, 2^33420661 is an apocalyptic number.

It is an amenable number.

33420661 is a deficient number, since it is larger than the sum of its proper divisors (31671).

33420661 is a wasteful number, since it uses less digits than its factorization.

33420661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31670.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 33420661 is about 5781.0605428416. The cubic root of 33420661 is about 322.1105962443.

The spelling of 33420661 in words is "thirty-three million, four hundred twenty thousand, six hundred sixty-one".