126281993 has 2 divisors, whose sum is σ = 126281994. Its totient is φ = 126281992.

The previous prime is 126281971. The next prime is 126282019. The reversal of 126281993 is 399182621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125708944 + 573049 = 11212^2 + 757^2 .

It is a cyclic number.

It is not a de Polignac number, because 126281993 - 2¹⁶ = 126216457 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126281993.

It is not a weakly prime, because it can be changed into another prime (126281963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63140996 + 63140997.

It is an arithmetic number, because the mean of its divisors is an integer number (63140997).

Almost surely, 2^126281993 is an apocalyptic number.

It is an amenable number.

126281993 is a deficient number, since it is larger than the sum of its proper divisors (1).

126281993 is an equidigital number, since it uses as much as digits as its factorization.

126281993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 126281993 is about 11237.5261067550. The cubic root of 126281993 is about 501.7035134922.

The spelling of 126281993 in words is "one hundred twenty-six million, two hundred eighty-one thousand, nine hundred ninety-three".