126865681 has 2 divisors, whose sum is σ = 126865682. Its totient is φ = 126865680.

The previous prime is 126865667. The next prime is 126865703. The reversal of 126865681 is 186568621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92467456 + 34398225 = 9616^2 + 5865^2 .

It is a cyclic number.

It is not a de Polignac number, because 126865681 - 2⁷ = 126865553 is a prime.

It is a super-2 number, since 2×126865681² = 32189802031187522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126865481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63432840 + 63432841.

It is an arithmetic number, because the mean of its divisors is an integer number (63432841).

Almost surely, 2^126865681 is an apocalyptic number.

It is an amenable number.

126865681 is a deficient number, since it is larger than the sum of its proper divisors (1).

126865681 is an equidigital number, since it uses as much as digits as its factorization.

126865681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 43.

The square root of 126865681 is about 11263.4666510804. The cubic root of 126865681 is about 502.4753002224.

The spelling of 126865681 in words is "one hundred twenty-six million, eight hundred sixty-five thousand, six hundred eighty-one".