126506491 has 2 divisors, whose sum is σ = 126506492. Its totient is φ = 126506490.

The previous prime is 126506483. The next prime is 126506521. The reversal of 126506491 is 194605621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 126506491 - 2³ = 126506483 is a prime.

It is not a weakly prime, because it can be changed into another prime (126506431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63253245 + 63253246.

It is an arithmetic number, because the mean of its divisors is an integer number (63253246).

Almost surely, 2^126506491 is an apocalyptic number.

126506491 is a deficient number, since it is larger than the sum of its proper divisors (1).

126506491 is an equidigital number, since it uses as much as digits as its factorization.

126506491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 126506491 is about 11247.5104356475. The cubic root of 126506491 is about 502.0006388779. Note that the first 3 decimals are identical.

The spelling of 126506491 in words is "one hundred twenty-six million, five hundred six thousand, four hundred ninety-one".