126557617 has 2 divisors, whose sum is σ = 126557618. Its totient is φ = 126557616.

The previous prime is 126557603. The next prime is 126557621. The reversal of 126557617 is 716755621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106523041 + 20034576 = 10321^2 + 4476^2 .

It is an emirp because it is prime and its reverse (716755621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126557617 - 2⁷ = 126557489 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126557617.

It is not a weakly prime, because it can be changed into another prime (126557657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63278808 + 63278809.

It is an arithmetic number, because the mean of its divisors is an integer number (63278809).

Almost surely, 2^126557617 is an apocalyptic number.

It is an amenable number.

126557617 is a deficient number, since it is larger than the sum of its proper divisors (1).

126557617 is an equidigital number, since it uses as much as digits as its factorization.

126557617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 40.

The square root of 126557617 is about 11249.7829756845. The cubic root of 126557617 is about 502.0682555085.

The spelling of 126557617 in words is "one hundred twenty-six million, five hundred fifty-seven thousand, six hundred seventeen".