1638832313 has 2 divisors, whose sum is σ = 1638832314. Its totient is φ = 1638832312.

The previous prime is 1638832303. The next prime is 1638832319. The reversal of 1638832313 is 3132388361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1514999929 + 123832384 = 38923^2 + 11128^2 .

It is a cyclic number.

It is not a de Polignac number, because 1638832313 - 2⁸ = 1638832057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1638832319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819416156 + 819416157.

It is an arithmetic number, because the mean of its divisors is an integer number (819416157).

Almost surely, 2^1638832313 is an apocalyptic number.

It is an amenable number.

1638832313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638832313 is an equidigital number, since it uses as much as digits as its factorization.

1638832313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 38.

The square root of 1638832313 is about 40482.4939078610. The cubic root of 1638832313 is about 1178.9937589040.

The spelling of 1638832313 in words is "one billion, six hundred thirty-eight million, eight hundred thirty-two thousand, three hundred thirteen".