33490781 has 2 divisors, whose sum is σ = 33490782. Its totient is φ = 33490780.

The previous prime is 33490777. The next prime is 33490801. The reversal of 33490781 is 18709433.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18783556 + 14707225 = 4334^2 + 3835^2 .

It is a cyclic number.

It is not a de Polignac number, because 33490781 - 2² = 33490777 is a prime.

It is a super-2 number, since 2×33490781² = 2243264823979922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33490181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16745390 + 16745391.

It is an arithmetic number, because the mean of its divisors is an integer number (16745391).

Almost surely, 2^33490781 is an apocalyptic number.

It is an amenable number.

33490781 is a deficient number, since it is larger than the sum of its proper divisors (1).

33490781 is an equidigital number, since it uses as much as digits as its factorization.

33490781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 33490781 is about 5787.1219962949. The cubic root of 33490781 is about 322.3357126496.

The spelling of 33490781 in words is "thirty-three million, four hundred ninety thousand, seven hundred eighty-one".