683011991 has 2 divisors, whose sum is σ = 683011992. Its totient is φ = 683011990.

The previous prime is 683011949. The next prime is 683011997. The reversal of 683011991 is 199110386.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-683011991 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (683011997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341505995 + 341505996.

It is an arithmetic number, because the mean of its divisors is an integer number (341505996).

Almost surely, 2^683011991 is an apocalyptic number.

683011991 is a deficient number, since it is larger than the sum of its proper divisors (1).

683011991 is an equidigital number, since it uses as much as digits as its factorization.

683011991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 683011991 is about 26134.4981011689. The cubic root of 683011991 is about 880.6623762181.

The spelling of 683011991 in words is "six hundred eighty-three million, eleven thousand, nine hundred ninety-one".