126838561 has 2 divisors, whose sum is σ = 126838562. Its totient is φ = 126838560.

The previous prime is 126838511. The next prime is 126838603. The reversal of 126838561 is 165838621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99380961 + 27457600 = 9969^2 + 5240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126838561 is a prime.

It is not a weakly prime, because it can be changed into another prime (126838501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63419280 + 63419281.

It is an arithmetic number, because the mean of its divisors is an integer number (63419281).

Almost surely, 2^126838561 is an apocalyptic number.

It is an amenable number.

126838561 is a deficient number, since it is larger than the sum of its proper divisors (1).

126838561 is an equidigital number, since it uses as much as digits as its factorization.

126838561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 40.

The square root of 126838561 is about 11262.2626945033. The cubic root of 126838561 is about 502.4394930569.

The spelling of 126838561 in words is "one hundred twenty-six million, eight hundred thirty-eight thousand, five hundred sixty-one".