126505019 has 2 divisors, whose sum is σ = 126505020. Its totient is φ = 126505018.

The previous prime is 126505009. The next prime is 126505061. The reversal of 126505019 is 910505621.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126505019 is a prime.

It is a super-2 number, since 2×126505019² = 32007039664380722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 126504982 and 126505000.

It is not a weakly prime, because it can be changed into another prime (126505009) 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, 63252509 + 63252510.

It is an arithmetic number, because the mean of its divisors is an integer number (63252510).

Almost surely, 2^126505019 is an apocalyptic number.

126505019 is a deficient number, since it is larger than the sum of its proper divisors (1).

126505019 is an equidigital number, since it uses as much as digits as its factorization.

126505019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 29.

The square root of 126505019 is about 11247.4449987542. Note that the first 3 decimals coincide. The cubic root of 126505019 is about 501.9986918163.

The spelling of 126505019 in words is "one hundred twenty-six million, five hundred five thousand, nineteen".