687133247 has 2 divisors, whose sum is σ = 687133248. Its totient is φ = 687133246.

The previous prime is 687133241. The next prime is 687133261. The reversal of 687133247 is 742331786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687133247 - 2¹² = 687129151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687133241) 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, 343566623 + 343566624.

It is an arithmetic number, because the mean of its divisors is an integer number (343566624).

Almost surely, 2^687133247 is an apocalyptic number.

687133247 is a deficient number, since it is larger than the sum of its proper divisors (1).

687133247 is an equidigital number, since it uses as much as digits as its factorization.

687133247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 41.

The square root of 687133247 is about 26213.2265659915. The cubic root of 687133247 is about 882.4301146017.

The spelling of 687133247 in words is "six hundred eighty-seven million, one hundred thirty-three thousand, two hundred forty-seven".