126000781 has 2 divisors, whose sum is σ = 126000782. Its totient is φ = 126000780.

The previous prime is 126000757. The next prime is 126000811. The reversal of 126000781 is 187000621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122544900 + 3455881 = 11070^2 + 1859^2 .

It is an emirp because it is prime and its reverse (187000621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126000781 - 2⁷ = 126000653 is a prime.

It is a super-2 number, since 2×126000781² = 31752393625219922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126000731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63000390 + 63000391.

It is an arithmetic number, because the mean of its divisors is an integer number (63000391).

Almost surely, 2^126000781 is an apocalyptic number.

It is an amenable number.

126000781 is a deficient number, since it is larger than the sum of its proper divisors (1).

126000781 is an equidigital number, since it uses as much as digits as its factorization.

126000781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 126000781 is about 11225.0069487729. The cubic root of 126000781 is about 501.3308293106.

The spelling of 126000781 in words is "one hundred twenty-six million, seven hundred eighty-one", and thus it is an aban number.