611801 has 2 divisors, whose sum is σ = 611802. Its totient is φ = 611800.

The previous prime is 611791. The next prime is 611803. The reversal of 611801 is 108116.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 490000 + 121801 = 700^2 + 349^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611801 is a prime.

It is a Sophie Germain prime.

Together with 611803, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 611801.

It is not a weakly prime, because it can be changed into another prime (611803) by changing a digit.

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

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305900 + 305901.

It is an arithmetic number, because the mean of its divisors is an integer number (305901).

2⁶¹¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

611801 is a deficient number, since it is larger than the sum of its proper divisors (1).

611801 is an equidigital number, since it uses as much as digits as its factorization.

611801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 611801 is about 782.1770899227. The cubic root of 611801 is about 84.8926441657.

Adding to 611801 its reverse (108116), we get a palindrome (719917).

The spelling of 611801 in words is "six hundred eleven thousand, eight hundred one".