126573409 has 2 divisors, whose sum is σ = 126573410. Its totient is φ = 126573408.

The previous prime is 126573401. The next prime is 126573413. The reversal of 126573409 is 904375621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126495009 + 78400 = 11247^2 + 280^2 .

It is a cyclic number.

It is not a de Polignac number, because 126573409 - 2³ = 126573401 is a prime.

It is not a weakly prime, because it can be changed into another prime (126573401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63286704 + 63286705.

It is an arithmetic number, because the mean of its divisors is an integer number (63286705).

Almost surely, 2^126573409 is an apocalyptic number.

It is an amenable number.

126573409 is a deficient number, since it is larger than the sum of its proper divisors (1).

126573409 is an equidigital number, since it uses as much as digits as its factorization.

126573409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 126573409 is about 11250.4848339972. The cubic root of 126573409 is about 502.0891375182.

The spelling of 126573409 in words is "one hundred twenty-six million, five hundred seventy-three thousand, four hundred nine".