1001634409 has 4 divisors (see below), whose sum is σ = 1008014404. Its totient is φ = 995254416.

The previous prime is 1001634401. The next prime is 1001634427. The reversal of 1001634409 is 9044361001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 267224409 + 734410000 = 16347^2 + 27100^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001634409 - 2³ = 1001634401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001634401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3189762 + ... + 3190075.

It is an arithmetic number, because the mean of its divisors is an integer number (252003601).

Almost surely, 2^1001634409 is an apocalyptic number.

It is an amenable number.

1001634409 is a deficient number, since it is larger than the sum of its proper divisors (6379995).

1001634409 is an equidigital number, since it uses as much as digits as its factorization.

1001634409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6379994.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1001634409 is about 31648.6083264336. The cubic root of 1001634409 is about 1000.5445064589.

The spelling of 1001634409 in words is "one billion, one million, six hundred thirty-four thousand, four hundred nine".