126165217 has 2 divisors, whose sum is σ = 126165218. Its totient is φ = 126165216.

The previous prime is 126165209. The next prime is 126165251. The reversal of 126165217 is 712561621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105042001 + 21123216 = 10249^2 + 4596^2 .

It is a cyclic number.

It is not a de Polignac number, because 126165217 - 2³ = 126165209 is a prime.

It is not a weakly prime, because it can be changed into another prime (126165617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63082608 + 63082609.

It is an arithmetic number, because the mean of its divisors is an integer number (63082609).

Almost surely, 2^126165217 is an apocalyptic number.

It is an amenable number.

126165217 is a deficient number, since it is larger than the sum of its proper divisors (1).

126165217 is an equidigital number, since it uses as much as digits as its factorization.

126165217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5040, while the sum is 31.

The square root of 126165217 is about 11232.3290995234. The cubic root of 126165217 is about 501.5488200259.

The spelling of 126165217 in words is "one hundred twenty-six million, one hundred sixty-five thousand, two hundred seventeen".