33781841 has 2 divisors, whose sum is σ = 33781842. Its totient is φ = 33781840.

The previous prime is 33781831. The next prime is 33781843. The reversal of 33781841 is 14818733.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32821441 + 960400 = 5729^2 + 980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33781841 is a prime.

It is a super-2 number, since 2×33781841² = 2282425562698562, which contains 22 as substring.

Together with 33781843, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (33781843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16890920 + 16890921.

It is an arithmetic number, because the mean of its divisors is an integer number (16890921).

Almost surely, 2^33781841 is an apocalyptic number.

It is an amenable number.

33781841 is a deficient number, since it is larger than the sum of its proper divisors (1).

33781841 is an equidigital number, since it uses as much as digits as its factorization.

33781841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 33781841 is about 5812.2148102079. The cubic root of 33781841 is about 323.2668002355.

The spelling of 33781841 in words is "thirty-three million, seven hundred eighty-one thousand, eight hundred forty-one".