33820861 has 2 divisors, whose sum is σ = 33820862. Its totient is φ = 33820860.

The previous prime is 33820819. The next prime is 33820867. The reversal of 33820861 is 16802833.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27092025 + 6728836 = 5205^2 + 2594^2 .

It is an emirp because it is prime and its reverse (16802833) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 33820861 - 2⁷ = 33820733 is a prime.

It is a super-2 number, since 2×33820861² = 2287701277562642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33820867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16910430 + 16910431.

It is an arithmetic number, because the mean of its divisors is an integer number (16910431).

Almost surely, 2^33820861 is an apocalyptic number.

It is an amenable number.

33820861 is a deficient number, since it is larger than the sum of its proper divisors (1).

33820861 is an equidigital number, since it uses as much as digits as its factorization.

33820861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 33820861 is about 5815.5705653014. The cubic root of 33820861 is about 323.3912163586.

The spelling of 33820861 in words is "thirty-three million, eight hundred twenty thousand, eight hundred sixty-one".