126553409 has 2 divisors, whose sum is σ = 126553410. Its totient is φ = 126553408.

The previous prime is 126553403. The next prime is 126553489. The reversal of 126553409 is 904355621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100000000 + 26553409 = 10000^2 + 5153^2 .

It is a cyclic number.

It is not a de Polignac number, because 126553409 - 2⁴ = 126553393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126553403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63276704 + 63276705.

It is an arithmetic number, because the mean of its divisors is an integer number (63276705).

Almost surely, 2^126553409 is an apocalyptic number.

It is an amenable number.

126553409 is a deficient number, since it is larger than the sum of its proper divisors (1).

126553409 is an equidigital number, since it uses as much as digits as its factorization.

126553409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 126553409 is about 11249.5959482997. The cubic root of 126553409 is about 502.0626909109.

The spelling of 126553409 in words is "one hundred twenty-six million, five hundred fifty-three thousand, four hundred nine".