6611993 has 2 divisors, whose sum is σ = 6611994. Its totient is φ = 6611992.

The previous prime is 6611989. The next prime is 6612013. The reversal of 6611993 is 3991166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5004169 + 1607824 = 2237^2 + 1268^2 .

It is a cyclic number.

It is not a de Polignac number, because 6611993 - 2² = 6611989 is a prime.

It is not a weakly prime, because it can be changed into another prime (6611923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3305996 + 3305997.

It is an arithmetic number, because the mean of its divisors is an integer number (3305997).

Almost surely, 2^6611993 is an apocalyptic number.

It is an amenable number.

6611993 is a deficient number, since it is larger than the sum of its proper divisors (1).

6611993 is an equidigital number, since it uses as much as digits as its factorization.

6611993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8748, while the sum is 35.

The square root of 6611993 is about 2571.3795908033. The cubic root of 6611993 is about 187.6912939541.

The spelling of 6611993 in words is "six million, six hundred eleven thousand, nine hundred ninety-three".