611993 has 2 divisors, whose sum is σ = 611994. Its totient is φ = 611992.

The previous prime is 611977. The next prime is 611999. The reversal of 611993 is 399116.

611993 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., 458329 + 153664 = 677^2 + 392^2 .

It is a cyclic number.

It is not a de Polignac number, because 611993 - 2⁴ = 611977 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 11.

It is not a weakly prime, because it can be changed into another prime (611999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305996 + 305997.

It is an arithmetic number, because the mean of its divisors is an integer number (305997).

2⁶¹¹⁹⁹³ is an apocalyptic number.

It is an amenable number.

611993 is a deficient number, since it is larger than the sum of its proper divisors (1).

611993 is an equidigital number, since it uses as much as digits as its factorization.

611993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 29.

The square root of 611993 is about 782.2998146491. The cubic root of 611993 is about 84.9015237867.

The spelling of 611993 in words is "six hundred eleven thousand, nine hundred ninety-three".