33681161 has 2 divisors, whose sum is σ = 33681162. Its totient is φ = 33681160.

The previous prime is 33681157. The next prime is 33681217. The reversal of 33681161 is 16118633.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 12924025 = 4556^2 + 3595^2 .

It is a cyclic number.

It is not a de Polignac number, because 33681161 - 2² = 33681157 is a prime.

It is a super-2 number, since 2×33681161² = 2268841212615842, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (33680161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16840580 + 16840581.

It is an arithmetic number, because the mean of its divisors is an integer number (16840581).

Almost surely, 2^33681161 is an apocalyptic number.

It is an amenable number.

33681161 is a deficient number, since it is larger than the sum of its proper divisors (1).

33681161 is an equidigital number, since it uses as much as digits as its factorization.

33681161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 33681161 is about 5803.5472773124. The cubic root of 33681161 is about 322.9453367224.

Adding to 33681161 its reverse (16118633), we get a palindrome (49799794).

The spelling of 33681161 in words is "thirty-three million, six hundred eighty-one thousand, one hundred sixty-one".