634067909 has 2 divisors, whose sum is σ = 634067910. Its totient is φ = 634067908.

The previous prime is 634067899. The next prime is 634067923. The reversal of 634067909 is 909760436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 572884225 + 61183684 = 23935^2 + 7822^2 .

It is a cyclic number.

It is not a de Polignac number, because 634067909 - 2¹⁶ = 634002373 is a prime.

It is a super-2 number, since 2×634067909² = 804084226447264562, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 634067909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634067969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317033954 + 317033955.

It is an arithmetic number, because the mean of its divisors is an integer number (317033955).

Almost surely, 2^634067909 is an apocalyptic number.

It is an amenable number.

634067909 is a deficient number, since it is larger than the sum of its proper divisors (1).

634067909 is an equidigital number, since it uses as much as digits as its factorization.

634067909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 44.

The square root of 634067909 is about 25180.7050933845. The cubic root of 634067909 is about 859.1030440031.

The spelling of 634067909 in words is "six hundred thirty-four million, sixty-seven thousand, nine hundred nine".