1638182801 has 2 divisors, whose sum is σ = 1638182802. Its totient is φ = 1638182800.

The previous prime is 1638182783. The next prime is 1638182813. The reversal of 1638182801 is 1082818361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1051380625 + 586802176 = 32425^2 + 24224^2 .

It is an emirp because it is prime and its reverse (1082818361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1638182801 - 2⁶ = 1638182737 is a prime.

It is not a weakly prime, because it can be changed into another prime (1638182201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 819091400 + 819091401.

It is an arithmetic number, because the mean of its divisors is an integer number (819091401).

Almost surely, 2^1638182801 is an apocalyptic number.

It is an amenable number.

1638182801 is a deficient number, since it is larger than the sum of its proper divisors (1).

1638182801 is an equidigital number, since it uses as much as digits as its factorization.

1638182801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 1638182801 is about 40474.4709786305. The cubic root of 1638182801 is about 1178.8379829947.

The spelling of 1638182801 in words is "one billion, six hundred thirty-eight million, one hundred eighty-two thousand, eight hundred one".