126920681 has 2 divisors, whose sum is σ = 126920682. Its totient is φ = 126920680.

The previous prime is 126920671. The next prime is 126920683. The reversal of 126920681 is 186029621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121440400 + 5480281 = 11020^2 + 2341^2 .

It is an emirp because it is prime and its reverse (186029621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126920681 - 2¹⁸ = 126658537 is a prime.

It is a super-2 number, since 2×126920681² = 32217718531007522, which contains 22 as substring.

Together with 126920683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126920683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63460340 + 63460341.

It is an arithmetic number, because the mean of its divisors is an integer number (63460341).

Almost surely, 2^126920681 is an apocalyptic number.

It is an amenable number.

126920681 is a deficient number, since it is larger than the sum of its proper divisors (1).

126920681 is an equidigital number, since it uses as much as digits as its factorization.

126920681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 126920681 is about 11265.9079083756. The cubic root of 126920681 is about 502.5479023334.

The spelling of 126920681 in words is "one hundred twenty-six million, nine hundred twenty thousand, six hundred eighty-one".