126308729081 has 2 divisors, whose sum is σ = 126308729082. Its totient is φ = 126308729080.

The previous prime is 126308729039. The next prime is 126308729089. The reversal of 126308729081 is 180927803621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117865875856 + 8442853225 = 343316^2 + 91885^2 .

It is a cyclic number.

It is not a de Polignac number, because 126308729081 - 2¹⁸ = 126308466937 is a prime.

It is a super-2 number, since 2×126308729081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126308729089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63154364540 + 63154364541.

It is an arithmetic number, because the mean of its divisors is an integer number (63154364541).

Almost surely, 2^126308729081 is an apocalyptic number.

It is an amenable number.

126308729081 is a deficient number, since it is larger than the sum of its proper divisors (1).

126308729081 is an equidigital number, since it uses as much as digits as its factorization.

126308729081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 47.

The spelling of 126308729081 in words is "one hundred twenty-six billion, three hundred eight million, seven hundred twenty-nine thousand, eighty-one".