126335681 has 2 divisors, whose sum is σ = 126335682. Its totient is φ = 126335680.

The previous prime is 126335659. The next prime is 126335683. The reversal of 126335681 is 186533621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124992400 + 1343281 = 11180^2 + 1159^2 .

It is a cyclic number.

It is not a de Polignac number, because 126335681 - 2¹⁰ = 126334657 is a prime.

It is a super-2 number, since 2×126335681² = 31921408587467522, which contains 22 as substring.

Together with 126335683, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_7181855 and since 126335681 and 7181855 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (126335683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63167840 + 63167841.

It is an arithmetic number, because the mean of its divisors is an integer number (63167841).

Almost surely, 2^126335681 is an apocalyptic number.

It is an amenable number.

126335681 is a deficient number, since it is larger than the sum of its proper divisors (1).

126335681 is an equidigital number, since it uses as much as digits as its factorization.

126335681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 126335681 is about 11239.9146349072. The cubic root of 126335681 is about 501.7746021231.

The spelling of 126335681 in words is "one hundred twenty-six million, three hundred thirty-five thousand, six hundred eighty-one".