606109991 has 2 divisors, whose sum is σ = 606109992. Its totient is φ = 606109990.

The previous prime is 606109981. The next prime is 606109997. The reversal of 606109991 is 199901606.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-606109991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (606109997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303054995 + 303054996.

It is an arithmetic number, because the mean of its divisors is an integer number (303054996).

Almost surely, 2^606109991 is an apocalyptic number.

606109991 is a deficient number, since it is larger than the sum of its proper divisors (1).

606109991 is an equidigital number, since it uses as much as digits as its factorization.

606109991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 606109991 is about 24619.3011882953. The cubic root of 606109991 is about 846.2859828029.

The spelling of 606109991 in words is "six hundred six million, one hundred nine thousand, nine hundred ninety-one".