33281361 has 15 divisors (see below), whose sum is σ = 49794283. Its totient is φ = 22152960.

The previous prime is 33281341. The next prime is 33281363. The reversal of 33281361 is 16318233.

It is a happy number.

The square root of 33281361 is 5769.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 30041361 + 3240000 = 5481^2 + 1800^2 .

It is not a de Polignac number, because 33281361 - 2⁵ = 33281329 is a prime.

It is a super-2 number, since 2×33281361² = 2215297980024642, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (33281363) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 51601 + ... + 52241.

Almost surely, 2^33281361 is an apocalyptic number.

33281361 is the 5769-th square number.

33281361 is the 2885-th centered octagonal number.

It is an amenable number.

33281361 is a deficient number, since it is larger than the sum of its proper divisors (16512922).

33281361 is an frugal number, since it uses more digits than its factorization.

33281361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1294 (or 644 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The cubic root of 33281361 is about 321.6624454092.

Adding to 33281361 its reverse (16318233), we get a palindrome (49599594).

The spelling of 33281361 in words is "thirty-three million, two hundred eighty-one thousand, three hundred sixty-one".