611021993 has 2 divisors, whose sum is σ = 611021994. Its totient is φ = 611021992.

The previous prime is 611021947. The next prime is 611022017. The reversal of 611021993 is 399120116.

611021993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418284304 + 192737689 = 20452^2 + 13883^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611021993 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (611021093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305510996 + 305510997.

It is an arithmetic number, because the mean of its divisors is an integer number (305510997).

Almost surely, 2^611021993 is an apocalyptic number.

It is an amenable number.

611021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

611021993 is an equidigital number, since it uses as much as digits as its factorization.

611021993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 611021993 is about 24718.8590553852. The cubic root of 611021993 is about 848.5659755767.

The spelling of 611021993 in words is "six hundred eleven million, twenty-one thousand, nine hundred ninety-three".