33618121 has 6 divisors (see below), whose sum is σ = 34131930. Its totient is φ = 33111936.

The previous prime is 33618119. The next prime is 33618139. The reversal of 33618121 is 12181633.

It can be written as a sum of positive squares in only one way, i.e., 28729600 + 4888521 = 5360^2 + 2211^2 .

It is not a de Polignac number, because 33618121 - 2¹ = 33618119 is a prime.

It is a super-2 number, since 2×33618121² = 2260356119141282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33618161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 745 + ... + 8233.

It is an arithmetic number, because the mean of its divisors is an integer number (5688655).

Almost surely, 2^33618121 is an apocalyptic number.

It is an amenable number.

33618121 is a deficient number, since it is larger than the sum of its proper divisors (513809).

33618121 is an frugal number, since it uses more digits than its factorization.

33618121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7623 (or 7556 counting only the distinct ones).

The product of its digits is 864, while the sum is 25.

The square root of 33618121 is about 5798.1135725337. The cubic root of 33618121 is about 322.7437285821.

Adding to 33618121 its reverse (12181633), we get a palindrome (45799754).

The spelling of 33618121 in words is "thirty-three million, six hundred eighteen thousand, one hundred twenty-one".