125553409 has 2 divisors, whose sum is σ = 125553410. Its totient is φ = 125553408.

The previous prime is 125553401. The next prime is 125553431. The reversal of 125553409 is 904355521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110187009 + 15366400 = 10497^2 + 3920^2 .

It is a cyclic number.

It is not a de Polignac number, because 125553409 - 2³ = 125553401 is a prime.

It is not a weakly prime, because it can be changed into another prime (125553401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62776704 + 62776705.

It is an arithmetic number, because the mean of its divisors is an integer number (62776705).

Almost surely, 2^125553409 is an apocalyptic number.

It is an amenable number.

125553409 is a deficient number, since it is larger than the sum of its proper divisors (1).

125553409 is an equidigital number, since it uses as much as digits as its factorization.

125553409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 34.

The square root of 125553409 is about 11205.0617579735. The cubic root of 125553409 is about 500.7367924073.

The spelling of 125553409 in words is "one hundred twenty-five million, five hundred fifty-three thousand, four hundred nine".