606243991 has 2 divisors, whose sum is σ = 606243992. Its totient is φ = 606243990.

The previous prime is 606243973. The next prime is 606244007. The reversal of 606243991 is 199342606.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 606243991 - 2⁷ = 606243863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (606243961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 303121995 + 303121996.

It is an arithmetic number, because the mean of its divisors is an integer number (303121996).

Almost surely, 2^606243991 is an apocalyptic number.

606243991 is a deficient number, since it is larger than the sum of its proper divisors (1).

606243991 is an equidigital number, since it uses as much as digits as its factorization.

606243991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 606243991 is about 24622.0224798858. The cubic root of 606243991 is about 846.3483444025.

The spelling of 606243991 in words is "six hundred six million, two hundred forty-three thousand, nine hundred ninety-one".