126220729 has 2 divisors, whose sum is σ = 126220730. Its totient is φ = 126220728.

The previous prime is 126220691. The next prime is 126220739. The reversal of 126220729 is 927022621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112360000 + 13860729 = 10600^2 + 3723^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126220729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126220729.

It is not a weakly prime, because it can be changed into another prime (126220739) 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, 63110364 + 63110365.

It is an arithmetic number, because the mean of its divisors is an integer number (63110365).

Almost surely, 2^126220729 is an apocalyptic number.

It is an amenable number.

126220729 is a deficient number, since it is larger than the sum of its proper divisors (1).

126220729 is an equidigital number, since it uses as much as digits as its factorization.

126220729 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 31.

The square root of 126220729 is about 11234.7999092107. The cubic root of 126220729 is about 501.6223688119.

The spelling of 126220729 in words is "one hundred twenty-six million, two hundred twenty thousand, seven hundred twenty-nine".