126563191 has 2 divisors, whose sum is σ = 126563192. Its totient is φ = 126563190.

The previous prime is 126563159. The next prime is 126563197. The reversal of 126563191 is 191365621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126563191 - 2⁵ = 126563159 is a prime.

It is a super-2 number, since 2×126563191² = 32036482632204962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126563197) 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, 63281595 + 63281596.

It is an arithmetic number, because the mean of its divisors is an integer number (63281596).

Almost surely, 2^126563191 is an apocalyptic number.

126563191 is a deficient number, since it is larger than the sum of its proper divisors (1).

126563191 is an equidigital number, since it uses as much as digits as its factorization.

126563191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 126563191 is about 11250.0307110692. The cubic root of 126563191 is about 502.0756262946.

The spelling of 126563191 in words is "one hundred twenty-six million, five hundred sixty-three thousand, one hundred ninety-one".