1687993201 has 2 divisors, whose sum is σ = 1687993202. Its totient is φ = 1687993200.

The previous prime is 1687993171. The next prime is 1687993249. The reversal of 1687993201 is 1023997861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 969699600 + 718293601 = 31140^2 + 26801^2 .

It is a cyclic number.

It is not a de Polignac number, because 1687993201 - 2⁹ = 1687992689 is a prime.

It is not a weakly prime, because it can be changed into another prime (1687993261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843996600 + 843996601.

It is an arithmetic number, because the mean of its divisors is an integer number (843996601).

Almost surely, 2^1687993201 is an apocalyptic number.

It is an amenable number.

1687993201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687993201 is an equidigital number, since it uses as much as digits as its factorization.

1687993201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 1687993201 is about 41085.1944257296. The cubic root of 1687993201 is about 1190.6667640170. Note that the first 3 decimals are identical.

The spelling of 1687993201 in words is "one billion, six hundred eighty-seven million, nine hundred ninety-three thousand, two hundred one".