126659993 has 2 divisors, whose sum is σ = 126659994. Its totient is φ = 126659992.

The previous prime is 126659987. The next prime is 126660019. The reversal of 126659993 is 399956621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64770304 + 61889689 = 8048^2 + 7867^2 .

It is a cyclic number.

It is not a de Polignac number, because 126659993 - 2⁴ = 126659977 is a prime.

It is not a weakly prime, because it can be changed into another prime (126659903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63329996 + 63329997.

It is an arithmetic number, because the mean of its divisors is an integer number (63329997).

Almost surely, 2^126659993 is an apocalyptic number.

It is an amenable number.

126659993 is a deficient number, since it is larger than the sum of its proper divisors (1).

126659993 is an equidigital number, since it uses as much as digits as its factorization.

126659993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 787320, while the sum is 50.

The square root of 126659993 is about 11254.3321880954. The cubic root of 126659993 is about 502.2035980442.

The spelling of 126659993 in words is "one hundred twenty-six million, six hundred fifty-nine thousand, nine hundred ninety-three".