1638034361 has 2 divisors, whose sum is σ = 1638034362. Its totient is φ = 1638034360.

The previous prime is 1638034351. The next prime is 1638034379. The reversal of 1638034361 is 1634308361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1145416336 + 492618025 = 33844^2 + 22195^2 .

It is a cyclic number.

It is not a de Polignac number, because 1638034361 - 2¹⁸ = 1637772217 is a prime.

It is not a weakly prime, because it can be changed into another prime (1638034301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819017180 + 819017181.

It is an arithmetic number, because the mean of its divisors is an integer number (819017181).

Almost surely, 2^1638034361 is an apocalyptic number.

It is an amenable number.

1638034361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638034361 is an equidigital number, since it uses as much as digits as its factorization.

1638034361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 1638034361 is about 40472.6371885994. The cubic root of 1638034361 is about 1178.8023760617.

The spelling of 1638034361 in words is "one billion, six hundred thirty-eight million, thirty-four thousand, three hundred sixty-one".