126299521 has 2 divisors, whose sum is σ = 126299522. Its totient is φ = 126299520.

The previous prime is 126299519. The next prime is 126299531. The reversal of 126299521 is 125992621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103632400 + 22667121 = 10180^2 + 4761^2 .

It is a cyclic number.

It is not a de Polignac number, because 126299521 - 2¹ = 126299519 is a prime.

Together with 126299519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (126299501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63149760 + 63149761.

It is an arithmetic number, because the mean of its divisors is an integer number (63149761).

Almost surely, 2^126299521 is an apocalyptic number.

It is an amenable number.

126299521 is a deficient number, since it is larger than the sum of its proper divisors (1).

126299521 is an equidigital number, since it uses as much as digits as its factorization.

126299521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 126299521 is about 11238.3059666482. The cubic root of 126299521 is about 501.7267246462.

The spelling of 126299521 in words is "one hundred twenty-six million, two hundred ninety-nine thousand, five hundred twenty-one".