6181993 has 2 divisors, whose sum is σ = 6181994. Its totient is φ = 6181992.

The previous prime is 6181969. The next prime is 6182039. The reversal of 6181993 is 3991816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3583449 + 2598544 = 1893^2 + 1612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6181993 is a prime.

It is not a weakly prime, because it can be changed into another prime (6181913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3090996 + 3090997.

It is an arithmetic number, because the mean of its divisors is an integer number (3090997).

Almost surely, 2^6181993 is an apocalyptic number.

It is an amenable number.

6181993 is a deficient number, since it is larger than the sum of its proper divisors (1).

6181993 is an equidigital number, since it uses as much as digits as its factorization.

6181993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 6181993 is about 2486.3613977055. The cubic root of 6181993 is about 183.5310304469.

The spelling of 6181993 in words is "six million, one hundred eighty-one thousand, nine hundred ninety-three".