634032409 has 2 divisors, whose sum is σ = 634032410. Its totient is φ = 634032408.

The previous prime is 634032401. The next prime is 634032437. The reversal of 634032409 is 904230436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 634032400 + 9 = 25180^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 634032409 - 2³ = 634032401 is a prime.

It is not a weakly prime, because it can be changed into another prime (634032401) 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, 317016204 + 317016205.

It is an arithmetic number, because the mean of its divisors is an integer number (317016205).

Almost surely, 2^634032409 is an apocalyptic number.

It is an amenable number.

634032409 is a deficient number, since it is larger than the sum of its proper divisors (1).

634032409 is an equidigital number, since it uses as much as digits as its factorization.

634032409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 634032409 is about 25180.0001787133. Note that the first 3 decimals coincide. The cubic root of 634032409 is about 859.0870106378.

The spelling of 634032409 in words is "six hundred thirty-four million, thirty-two thousand, four hundred nine".