1638576313 has 12 divisors (see below), whose sum is σ = 1802288320. Its totient is φ = 1488615480.

The previous prime is 1638576301. The next prime is 1638576319. The reversal of 1638576313 is 3136758361.

It is a happy number.

It is not a de Polignac number, because 1638576313 - 2¹⁷ = 1638445241 is a prime.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1638576313.

It is not an unprimeable number, because it can be changed into a prime (1638576319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 223756 + ... + 230962.

Almost surely, 2^1638576313 is an apocalyptic number.

It is an amenable number.

1638576313 is a deficient number, since it is larger than the sum of its proper divisors (163712007).

1638576313 is a wasteful number, since it uses less digits than its factorization.

1638576313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9108 (or 9097 counting only the distinct ones).

The product of its digits is 272160, while the sum is 43.

The square root of 1638576313 is about 40479.3319238349. The cubic root of 1638576313 is about 1178.9323659808.

The spelling of 1638576313 in words is "one billion, six hundred thirty-eight million, five hundred seventy-six thousand, three hundred thirteen".