126525409 has 2 divisors, whose sum is σ = 126525410. Its totient is φ = 126525408.

The previous prime is 126525403. The next prime is 126525439. The reversal of 126525409 is 904525621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88887184 + 37638225 = 9428^2 + 6135^2 .

It is an emirp because it is prime and its reverse (904525621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126525409 - 2⁷ = 126525281 is a prime.

It is not a weakly prime, because it can be changed into another prime (126525403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63262704 + 63262705.

It is an arithmetic number, because the mean of its divisors is an integer number (63262705).

Almost surely, 2^126525409 is an apocalyptic number.

It is an amenable number.

126525409 is a deficient number, since it is larger than the sum of its proper divisors (1).

126525409 is an equidigital number, since it uses as much as digits as its factorization.

126525409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 126525409 is about 11248.3513903149. The cubic root of 126525409 is about 502.0256609793.

The spelling of 126525409 in words is "one hundred twenty-six million, five hundred twenty-five thousand, four hundred nine".