687133189 has 2 divisors, whose sum is σ = 687133190. Its totient is φ = 687133188.

The previous prime is 687133171. The next prime is 687133241. The reversal of 687133189 is 981331786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 423330625 + 263802564 = 20575^2 + 16242^2 .

It is a cyclic number.

It is not a de Polignac number, because 687133189 - 2⁷ = 687133061 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687133169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343566594 + 343566595.

It is an arithmetic number, because the mean of its divisors is an integer number (343566595).

Almost surely, 2^687133189 is an apocalyptic number.

It is an amenable number.

687133189 is a deficient number, since it is larger than the sum of its proper divisors (1).

687133189 is an equidigital number, since it uses as much as digits as its factorization.

687133189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 46.

The square root of 687133189 is about 26213.2254596797. The cubic root of 687133189 is about 882.4300897734.

The spelling of 687133189 in words is "six hundred eighty-seven million, one hundred thirty-three thousand, one hundred eighty-nine".