126720491 has 2 divisors, whose sum is σ = 126720492. Its totient is φ = 126720490.

The previous prime is 126720469. The next prime is 126720493. The reversal of 126720491 is 194027621.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126720491 - 2⁶ = 126720427 is a prime.

It is a Sophie Germain prime.

Together with 126720493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126720493) 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, 63360245 + 63360246.

It is an arithmetic number, because the mean of its divisors is an integer number (63360246).

Almost surely, 2^126720491 is an apocalyptic number.

126720491 is a deficient number, since it is larger than the sum of its proper divisors (1).

126720491 is an equidigital number, since it uses as much as digits as its factorization.

126720491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 126720491 is about 11257.0196322117. The cubic root of 126720491 is about 502.2835429859.

The spelling of 126720491 in words is "one hundred twenty-six million, seven hundred twenty thousand, four hundred ninety-one".